I love Tuta as well, they are great. But not being able to use Tuta with thunderbird was a deal breaker for me. Proton is Swiss btw.

A linux phone is on my list, Jolla or similar. One battle at a time.

I usually tell people the same, this is a decision I will have to live with. I am happy with Proton and also happy to support their growth, hopefully it will go well for a long time.

From the other services I tried, Filen and Ente deserve an honorable mention. I was close to just go Mail Plus + Filen + Ente. But as soon as you do Proton Mail + VPN, you then go with Proton Unlimited and that is what makes the most sense financially.