I have used such software - though, it didn't affect me, since I wasn't on neither macos nor windows. As long as it's a request, and not an additional restricti

I have used such software - though, it didn't affect me, since I wasn't on neither macos nor windows. As long as it's a request, and not an additional restriction on the GPL license, it's legal. Since it's free software, one can hack it out. If I'd ever write software that gets ported to a platform I massively dislike, I'd add a nagging box aswell. Or perhaps would even refuse to merge the port, since then I could be expected to support it, which I won't.