I am super annoyed by them as well. Maybe try this filter rule:

  ||accounts.google.com/gsi/iframe/select$subdocument

This is working for me in Firefox on Android on twitter.com. I am not using any Google accounts whatsoever, though, so no guarantee that this doesn't break Google's login flow elsewhere.

I block with my list here: https://raw.githubusercontent.com/aembleton/Arthurs-Annoyanc...

But, you can just add this to your filters or your own list

  accounts.google.com$domain=~google.*|~youtube.com|~gmail.com

There should be a list for them.