I specifically said anecdotlly. Your experience and my experience a not representative of anything. Also that is only a small portion of my comment and was meant more a a sidenote.
We were also not talking about windowed mode at all here. It was specifically about what happens when you press the green window control button, which as far as I know puts the app in fullscreen on macos and the equivalent on any other OS known to me is to maximize the window.
I don't think that is even necessary. If you download the .torrent file from a trusted source it will already contain a secure hash of the final file. Also every piece you receive also comes with a hash that can also be verified through the .torrent file. If you don't trust the source enough to provide a valid .torrent, I don't see how downloading the image directly from them makes any difference. Read more: Official BitTorrent BEP BitTorrent V2 and SHA-256