With a recent macOS Sequoia update, apps capturing your screen would trigger a new notification that shows next to the menubar. For apps like AltTab which take screenshots of your screen for their functionality, this results in a constant flood of notifications every time the app is used.

Apparently, this new feature was not on purpose. It was supposed to only show a notification once every 30 days. But through some misconfiguration of the timestamps in the ScreenCaptureApprovals.plist file, the notification was not limited to 30 days. To fix this, find the file with:

open $HOME/Library/Group\ Containers/group.com.apple.replayd

and move or delete the ScreenCaptureApprovals.plist file from the opened folder. Then directly restart your Mac. The macOS system will automatically rewrite the file with corrected timestamps and the screen capture notifications are finally gone.