I am now wondering whether it is something in the Ren'Py generated APK files. I had one player tell me that their virus scanner reported problems with it, and a search on the internet showed me that some virus scanners do that, but it is a false positive. However, if itch has a system that triggers in the same way, it would explain why any change causes them to quarantaine my games (and other people's games as well). If that is the case, then perhaps using a different Ren'Py version would resolve the issue (I am currently on 8.3.7). I would try this, but the problem is that I am putting my games in quarantaine again if it is something different. If only itch would tell me what the issue is...