As someone posted above, someone obtaining access to your encrypted data might lead to an issue in the future:

https://en.wikipedia.org/wiki/Harvest_now,_decrypt_later

It’s nothing at all like using Drive, because the payload is encrypted.

Strange - I’m on Fedora Wayland using the flatpak version without any issues.

As with any EU company, the Swiss government can compel them to keep logs for an individual user in the case of serious crime. You can use Tor as Proton recommends for that exact use case.

But by default Proton does not keep logs of IP addresses.