diff --git a/features/attribution-reporting.yml b/features/attribution-reporting.yml
index 1b9fcc23869..740406d5685 100644
--- a/features/attribution-reporting.yml
+++ b/features/attribution-reporting.yml
@@ -1,6 +1,12 @@
 name: Attribution reporting
-description: The Attribution Reporting API measures when an ad click or view leads to a conversion, such as a purchase on an advertiser site.
+description: The attribution reporting API measures when an ad click or view leads to a conversion, such as a purchase on an advertiser site.
 spec: https://wicg.github.io/attribution-reporting-api/
+discouraged:
+  # removal_date: 2026-06-01 # Chrome 150
+  # reason: Due to declining interest from web developers and lack of interest from other browser vendors, Google decided to withdraw many Privacy Sandbox features including the attribution reporting API.
+  according_to:
+    - https://privacysandbox.com/news/update-on-plans-for-privacy-sandbox-technologies/
+    - https://chromestatus.com/feature/5194473869017088
 compat_features:
   - api.HTMLAnchorElement.attributionSrc
   - api.HTMLAreaElement.attributionSrc
diff --git a/features/related-website-sets.yml b/features/related-website-sets.yml
new file mode 100644
index 00000000000..43a73c72859
--- /dev/null
+++ b/features/related-website-sets.yml
@@ -0,0 +1,15 @@
+name: Related website sets
+description: Related website sets declares relationships between sites so the browser allows cookie and storage access between them through methods such as `document.requestStorageAccessFor()`.
+spec:
+  - https://wicg.github.io/first-party-sets/
+  - https://privacycg.github.io/requestStorageAccessFor/
+discouraged:
+  # removal_date: 2026-06-01 # Chrome 150
+  # reason: Due to declining interest from web developers and lack of interest from other browser vendors, Google decided to withdraw many Privacy Sandbox features including related website sets.
+  according_to:
+    - https://privacysandbox.com/news/update-on-plans-for-privacy-sandbox-technologies/
+    - https://chromestatus.com/feature/5162221567082496
+    - https://chromestatus.com/feature/5194473869017088
+compat_features:
+  - api.Document.requestStorageAccessFor
+  - api.Permissions.permission_top-level-storage-access
diff --git a/features/related-website-sets.yml.dist b/features/related-website-sets.yml.dist
new file mode 100644
index 00000000000..76650256039
--- /dev/null
+++ b/features/related-website-sets.yml.dist
@@ -0,0 +1,23 @@
+# Generated from: related-website-sets.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    chrome: "119"
+    chrome_android: "120"
+    edge: "119"
+compat_features:
+  # baseline: false
+  # support:
+  #   chrome: "113"
+  #   chrome_android: "120"
+  #   edge: "113"
+  - api.Permissions.permission_top-level-storage-access
+
+  # baseline: false
+  # support:
+  #   chrome: "119"
+  #   chrome_android: "119"
+  #   edge: "119"
+  - api.Document.requestStorageAccessFor
diff --git a/features/shared-storage.yml b/features/shared-storage.yml
index fdcf440ed0a..5d423b356d5 100644
--- a/features/shared-storage.yml
+++ b/features/shared-storage.yml
@@ -1,6 +1,12 @@
 name: Shared storage
 description: The `sharedStorage` API stores data to a shared space where the data can then be processed without the ability to track users across the different sites they visit. A common use case is measuring the reach of third-party ads without using user-tracking cookies."
 spec: https://wicg.github.io/shared-storage/
+discouraged:
+  # removal_date: 2026-06-01 # Chrome 150
+  # reason: Due to declining interest from web developers and lack of interest from other browser vendors, Google decided to withdraw many Privacy Sandbox features including shared storage.
+  according_to:
+    - https://privacysandbox.com/news/update-on-plans-for-privacy-sandbox-technologies/
+    - https://chromestatus.com/feature/5076349064708096
 group:
   - storage
   - worklets
diff --git a/features/storage-access.yml b/features/storage-access.yml
index a1a520da5b2..40540320869 100644
--- a/features/storage-access.yml
+++ b/features/storage-access.yml
@@ -7,8 +7,6 @@ status:
 compat_features:
   - api.Document.hasStorageAccess
   - api.Document.requestStorageAccess
-  - api.Document.requestStorageAccessFor
   - api.Permissions.permission_storage-access
-  - api.Permissions.permission_top-level-storage-access
   - html.elements.iframe.allow.storage-access
   - http.headers.Permissions-Policy.storage-access
diff --git a/features/storage-access.yml.dist b/features/storage-access.yml.dist
index c3540da373e..b92851375c5 100644
--- a/features/storage-access.yml.dist
+++ b/features/storage-access.yml.dist
@@ -43,17 +43,3 @@ compat_features:
   #   edge: "113"
   - html.elements.iframe.allow.storage-access
   - http.headers.Permissions-Policy.storage-access
-
-  # baseline: false
-  # support:
-  #   chrome: "113"
-  #   chrome_android: "120"
-  #   edge: "113"
-  - api.Permissions.permission_top-level-storage-access
-
-  # baseline: false
-  # support:
-  #   chrome: "119"
-  #   chrome_android: "119"
-  #   edge: "119"
-  - api.Document.requestStorageAccessFor
diff --git a/features/topics.yml b/features/topics.yml
index 2ec72e29625..a09823f3ba4 100644
--- a/features/topics.yml
+++ b/features/topics.yml
@@ -1,6 +1,12 @@
 name: Topics
-description: The Topics API reports a user's likely subject-matter interests (as determined by the browser, known as topics) to iframes. This allows for interest-based advertising that does not rely on user's exact browsing history, third-party cookies, or fingerprinting.
+description: The topics API reports a user's likely subject-matter interests (as determined by the browser, known as topics) to iframes. This allows for interest-based advertising that does not rely on user's exact browsing history, third-party cookies, or fingerprinting.
 spec: https://patcg-individual-drafts.github.io/topics/
+discouraged:
+  # removal_date: 2026-06-01 # Chrome 150
+  # reason: Due to declining interest from web developers and lack of interest from other browser vendors, Google decided to withdraw many Privacy Sandbox features including the topics API.
+  according_to:
+    - https://privacysandbox.com/news/update-on-plans-for-privacy-sandbox-technologies/
+    - https://chromestatus.com/feature/5135370673061888
 compat_features:
   - api.Document.browsingTopics
   - html.elements.iframe.browsingtopics