I can understand the confusion. But it kinda makes sense.... if my hypothesis is correct.
Proton Drive has the concepts of "My Files" and "Computers". Files stored under "Computer" (where you can have synced files for up to 10 computers, according to docs) tracks the files for each computer individually.
So when you uninstall Drive and delete the files, they are only stored in the cloud. But after reinstalling it again, it sees the files locally for that computer is gone ... so it gets removed in the cloud.
Had these files been moved to "My Files" in before the reinstall, this should not have happened.
At least, that's my theory.
@jon@vivaldi.net I use a plethora of browsers.
I'm migrating fron Firefox to LibreWolf (sorry, I prefer non-chrome based browsers), but have a Ungoogled Chromium as a backup those times Firefox/LibreWolf doesn't cut it (I thought the world had learnt a lesson from the IE days; seems we need to educate a new generation web hipsters).
On Android I use the default browser (in @e_mydata@mastodon.social) for a few news/blog sites, Mull and Vivaldi for some other sites and DuckDuckGo when searching. Default browser is Mull with Privacy Mode enabled by default.
I honestly don't like that the Chrome based browsers seems to be dominating these days. We need a heterogeneous web render environment to ensure a single dominant player dictates how things will be for users.
And without such competition, I fear there will be a lesser drive to further improve browsers. Just like when Netscape seemed too complacent with their own browsers back in the days.