Google Messages RCS is not working on rooted, custom ROM Android phones

I feel like the article's title is wrong: It is not that "it is not working".

It's that Google actively shadow bans users. It's not a bug or anything.

Also, this is not RCS if login requires loggin into Google garden. Let's stop calling it RCS.

I want to say that it's just the strict equivalent to iMessage, but no, iMessage doesn't prevent you from receiving messages, and Apple public communication doesn't pretend iMessage is "standard".

They have thoroughly embraced and extended your chat protocol. Are you not entertained?