Silly whataboutism. When there are multiple Linux package management solutions to choose from that are functional, decentralized, and fully FOSS, including ones that work across distros, switching to the proprietary Canonical-controlled Snap Store is moving backward for no good reason.
The Snap Store server is completely proprietary and fully controlled by Canonical.
AES is a specification, not a piece of software. Closed-source software like iCloud that implements the AES specification is still proprietary.
Vote here and leave a message to let Proton know how important a Linux client for Proton Drive is.
iCloud is proprietary by definition because Apple has not publicly released its source code under a free license.
Assuming that you’ll take advantage of the extra Drive space, that’s two services (since Calendar is part of Mail), so I think subscribing to Unlimited would be worth it for you.
Try out the free versions of the apps and decide whether you would pay for at least two of them.
Since I already use other alternatives like Bitwarden for many of Proton’s services, I’m only using Proton Mail and I can’t justify subscribing to Proton Unlimited until they release a Linux desktop client for Proton Drive.
That’s not the worst possible scenario, I’d love to see the Snap Store completely replaced with decentralized FOSS alternatives. Any scenario in which the Snap Store takes market share from decentralized FOSS alternatives is considerably worse.
Also, who said I wouldn’t use proprietary apps? I refuse to use Snap because Flatpak and other FOSS application packaging solutions that aren’t locked to a store controlled by a single for-profit company already serve my needs. I don’t have any objection to using proprietary apps that don’t have alternatives that meet my needs.