CHROME (google) is planing to implement DRM (kinda) into their browser
looks like rendering adblockers extensions obsolete with manifest-v3 was not enough so now they try to implement DRM into the browser giving the ability to any website to refuse traffic to you if you don't run a complaint browser ( cough...firefox )
here is an article in hacker news since i'm sure they can explain this to you better than i.
and also some github docs
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tuta has had desktop clients since the end of 2018. https://tutanota.com/blog/posts/desktop-clients/ if you're interested
if i can't use it in my already existing mail client it doesn't exist to me
This. I'm much interested in Protonmail and Tuta, but until they can support SMTP / IMAP or have a publicly accessible bridge to operate with client-side mail, they're absolute nonstarters for me.