Side note: I am wondering how best to highlight this as a clear example of anti-competitive behavior on part of Google.

Our Yunohost hosts e-mail, #Nextcloud, other services that can be seen as "competing" (not in scale, but in function) with some Google services.

Google flagging @yunohost login pages as "deceptive" makes it considerably harder to self-host.

And it doesn't matter if it is on purpose or accidental. Google has the resources to not make such "mistakes".