There’s also Migadu which I currently use. It doesn’t have all the bells and whistles that providers like Proton and Tuta have with their E2EE but they don’t use any shady marketing or track you. Requires a custom domain though.

I recommend switching to a custom domain in the future so you can avoid situations like this from happening again, this way you won’t be locked down onto a single provider.

They have a large following on Mastodon so this doesn’t really make much sense. I’m inclined to believe that they left due to the hate they were getting because of the recent controversy.