view the rest of the comments
Proton
Empowering you to choose a better internet where privacy is the default. Protect yourself online with Proton Mail, Proton VPN, Proton Calendar, Proton Drive. Proton Pass and SimpleLogin.
Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
Proton VPN is the world’s only open-source, publicly audited, unlimited and free VPN. Swiss-based, no-ads, and no-logs.
Proton Calendar is the world's first end-to-end encrypted calendar that allows you to keep your life private.
Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
It's unclear that they need to handle a specific flavor when they could release a Flatpak. I think the community wouldn't have any problem tweaking the dependencies for particular distros.
It wouldn't be the distribution method that is challenging, it's the complicated task of monitoring your filesystem for changes, and working with a dozen or so different file systems to do it (the way it's accomplished on an ext4 partition might not work on btrfs, for example).
I'm not skilled enough to be able to speak to that.
Maybe I'm in the minority, but all I need is a fuse plugin. I don't need specific syncing like a OneDrive/Google Drive app.
Why not use rclone? It can mount proton drive.
I agree, the reasoning seems rather outdated. Flatpaks are pretty good.
Flatpak is not the answer here. For example, flatpak version of codium doesn't recognise terminal settings out of the box. Since such trivial thing is a problem, image how difficult it would be to use it with various file systems, sync options, etc.