Well, I thought it was cute.

The technical limitation of not running iOS I guess.

The ProtonBridge used to be garbage so people have wanted a dedicated app for awhile now. Over the past year or two, the Bridge finally works fairly reliably so …a little too late.

And a paying customer to use the desktop app too. Well, besides a 14 day free trial.

And that they decided to go with RPM and DEB instead of just doing a Flatpak

https://9to5linux.com/ubports-is-switching-to-a-fixed-release-model-for-ubuntu-touch-ota-updates

Doesn’t sound dead to me

Wouldn’t really consider Fastmail privacy centric, but Proton sure. And a definite step up from Gmail.

Sounds like Debian is your answer.

Used it for a little bit. Seemed really nice, but it was quite janky so I backed out and went back to Mailbox. Feel like I dodged a bullet.