> Regarding NixOS, I'm mostly afraid of them going on a user purge after their developer purge

... Why? I don't know what developer purge you're talking about, but getting rid of people running a project almost never means suddenly they'll start to get rid of users, I'm not sure why that assumption is there. Not to mention that they couldn't even "purge users" if they wanted to, unless they make the download URLs private and start including some licensing schema which, come on, hardly is realistic to be worried about...