One thing which bothers me: for the freeorion snap we did not find a good solution for save games yet. We do not have a cloud save option or similar, so we rely on the local filesystem.
If somebody removes the snap, the save games are gone without a warning. This will probably break expectations in a really bad way. The best case if someone did this is that they find this out and are able to figure out that they able to restore it, before it gets permanently deleted after the default 30~ day timeout. I am not sure what to do about it, it may be mostly an UX issue/managing the exjpectations of the users. One simple fix would be to give some info on removal, maybe project defined.
E.g.: “Your save games get deleted when you remove this snap. You have 30 days to restore the snap before the data is deleted permanently. Consider to copy the save games from … to another location.”.
And some info when getting info about a removed snap. E.g. “You removed this snap 27days ago, you have 3 more days to restore your related local user data”.