diff --git a/ios/chrome/browser/collaboration/model/data_sharing_tab_helper.mm b/ios/chrome/browser/collaboration/model/data_sharing_tab_helper.mm
--- a/ios/chrome/browser/collaboration/model/data_sharing_tab_helper.mm
+++ b/ios/chrome/browser/collaboration/model/data_sharing_tab_helper.mm
@@ -23,9 +23,13 @@ bool ShouldHandleShareURLNavigation(
   if (!request_info.target_frame_is_main) {
     return false;
   }

-  if (request_info.is_user_initiated && !request_info.user_tapped_recently) {
-    return false;
-  }
+  // Mirror the desktop/Android throttle: reject renderer-initiated navigations
+  // that lack a recent user gesture. On iOS, `is_user_initiated` is derived
+  // from HasUserTappedRecently(), so the previous `is_user_initiated &&
+  // !user_tapped_recently` test was unsatisfiable and effectively a no-op.
+  if (!request_info.is_user_initiated && !request_info.user_tapped_recently) {
+    return false;
+  }

   return true;
   // LINT.ThenChange(/chrome/browser/data_sharing/data_sharing_navigation_throttle.cc:ShouldHandleShareURLNavigation)