I usually stay away from the political content for the reason you mentioned, but I figured I’d chime in and say I think this was a good decision. Stonetoss is a piece of shit, but there are plenty of other places on the internet for posts like that to happen.
My experience has been fine. If you go into Proton Mail with the understanding that you’re doing it to stop Google from data mining your email, and not for the sake of truly private/anonymous email, you’ll have a good time. The aliasing feature is super nice as well.