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Manifestos, Fear, and ‘Loser Thinking’: Inside Proton’s AI Reckoning
(www.404media.co)
This is a most excellent place for technology news and articles.
Tuta is based in Germany, so they are more likely to have to comply with information requests as Germany is part of the 14 Eyes international information sharing network. Thus countries like the USA may be able to get your info from Tuta legally.
Other than that? Honestly I'm not sure.
you can look at the privacy policy to see what they store unencrypted. tldr; don't use if you suspect that governments are after you, but otherwise it's fine. for governments i think protonmail is still the best option, but if that goes to shit, startmail is a valid alternative.
https://tuta.com/privacy-policy
https://www.startmail.com/privacy
https://proton.me/legal/privacy