This "App Cleaner and Uninstaller" belongs to a suite which main app is "MacCleaner Pro".
Be careful if you use 3rd-party cloud storage like in my case Proton Drive. Everything on that drive was saved offline and uploaded when I got that app. The offline files were stored in the hidden user library "/Users/username/Library/Cloud Storage".
Maybe a day later when everything got uploaded it showed me purgeable space of about 560GB that looked harmless to remove, although I did not really understand the description.
I clicked on "Review to Clean up" and after that all my about 500GB Proton Drive offline Data was gone. I still saw all files, but they were only available online.
Now I just leave the 112GB just alone. It's the same purgeable amount also Finder is showing and the Proton content was also always included there. Same for Disk Utility.
An by the way the complete offline data from Proton wasn't counted in System Settings / General / Storage. It was just free storage as if it doesn't exist offline.
I don't know if it's some kind of protection or a bug, but you can't just put files in an empty folder with the same proton account name and location and identical content to prevent downloading everything again.
Even if you remove the Proton Drive app and everything that belongs to it with such an uninstaller before and make a clean install where just the files are in the right folder on first launch of the Proton Drive app.
It somehow gets confused and you better close the app remove the data and download everything again or delete everything online and upload it again.
This was very annoying because my Internet is not very fast. And it happened even a second time with more data, because the first time I thought it's Proton's fault and the app just deleted everything when finished uploading. But I did not find a setting or information for that and the support told me it's not standard behavior of deleting everything offline when the upload is finished. Otherwise you get double uploads, non-working uploads and non-working downloads, but not for everything.
I think it took me several days to download maybe half of it and I was still angry on Proton and just deleted everything online and thought about not using it at all. Alone the thing that I can't copy the whole data on my second before installing Proton Drive. It some does not work that way.
I am also still not sure if it's the cleaner app's fault or macOS that just marks data as purgeable only because it's also available online or Proton put the files in the wrong location.
I lately moved them out of there and put them in my user folder. I can't use the Proton app with just choosing a different location for the offline data, but at least it's listed as real data now and nothing will purge it.
