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Proton Mail Finally Releases Desktop Apps With a Linux Beta Version
(news.itsfoss.com)
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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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Still, if an user prefers the convenience of using any client instead of e2e, could enable it in a setting. Maybe the user subscribed because they liked the interface and the overall features of the plan, and not because of the encrypted email solution and just wants to add the account on the mobile client instead of a dedicated app
Being closed like this IMHO is just to increase user retention
E2E is their flagship feature and pretty much only selling point. I'm really not surprised they don't allow to just disable it.