@VolumetricShitCompressor What kills it for me is the lack of IMAP/POP/SMTP support. I realise this is at odds with the E2E encryption, but honestly I find that portability more valuable than E2E. E2E in email is kinda overrated unless both parties are using PGP or something I think, and even then it's not necessary on a provider level.
I would also look into allegations of the creator supporting Trump before considering it again (saying this neutrally as I haven't verified it myself yet).
@VolumetricShitCompressor When I was looking into it the other day, that's what it seemed like to me. Goes for both them and tuta (the two most popular EU alternatives), and seems to be a direct consequence of their privacy focus.