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After I posted my comment I found this https://protonvpn.com/support/linux-prerelease/
To reply to your comment: they do send out emails regarding product development occasionally but there's no publicly available "roadmap". I can understand why as development times are hard to predict, so I don't fault them for that.
I can say that even though they are majorly updating things every week, they do make constant progress and release new products. I've been a subscriber for years, back when it was only "ProtonMail".
Now we have Proton Mail, VPN, Calendar, Drive, and Proton Pass. I'm glad my money has been supporting the vision and development of all these great privacy-first services. For me that's why I have been a loyal customer all these years.
Thank you for the link. While it's hard to predict how much time it takes to develop things, it would be nice to have a sneak peek as to what they are working on exactly.
For the rest, i agree with you; like you, i've been using proton for years (paid), and recently upgraded to unlimited. (For people that find it very pricey, i can only say that i love their products, their customer service is good, and i also want to support their mission).