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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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I don't use or trust Proton either. My point was that when you use gmail you are giving up additional data and your freedom.
The best answer is to use an email provider that doesn't force you to use non-free software. There a limited few that work with HTML or properly licensed JavaScript