I can't seem to block them by just enabling annoyances blocks on my end.
"EasyList – Other Annoyances" has this:
! Google signin popup
###credential_picker_container
###credential_picker_iframe
"AdGuard – Popup Overlays" has this:
! Warning: check, if auth using Google is not broken
||accounts.google.com/gsi/client^$third-party,script,domain=<several specific domains here>
My impression is that the rules want to avoid breaking Google sign-in completely, which this rule may do.
It's a thing!