Not a recommendation but I too trust Disroot pretty much. You can get a custom domain there without “buying a paid plan” once you make a donation. Would that be an option for you?

Using multiple providers (having multiple accounts) is a good idea, though. Don’t put all the eggs in one basket. I’ve never heard the two providers you mentioned, so I can’t tell. If you can sign up anonymously via Tor, if they’re Google-free + not behind CF, and (most importantly) they feel “good” (subjective but gut feeling…), I think they’re usable.

If their support use PGP, that’s a good sign too. (Proton even don’t share its pub key iirc.) If they also accept the privacy coin like Disroot and Tuta do, that’s nice too. Ultimately, though, believe your gut feeling, because everyone has different priorities, different thread models, etc.