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Proton Mail Finally Releases Desktop Apps With a Linux Beta Version
(news.itsfoss.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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On a lighter note, the protocol might be proprietary but the bridge still seems to be fully open source : https://github.com/ProtonMail/proton-bridge
I don't think think Proton shows bad will on this one. The only alternative I can think of (as a non expert) would be IMAP + GPG encrypted emails but very few desktop clients support GPG, which would make them less accessible 🤷♂️ Having their own protocol also probably makes it much much easier for them to iterate on it, opening up usually makes think much robust but also slower.
The bridge Is "open" but somehow it works only for premium users.