I don’t know why the article chooses Authy to showcase the issue, when it’s an app that is trivially replaced by alternatives (if one is patient enough to migrate). Finance and streaming apps are hardly equivalent on the other hand.
“We don’t want to punish users of alternative OSes, but there’s really no other option at the moment,” Wilden added before his blunt conclusion. “Play Integrity has absolutely no way to guess whether a given custom OS completely subverts the Android security model.”