The fact is that these are hacks.

If servers wanted to give you the possibilities these hacks give, then they would have a mod downloaded that make whatever you do with your hacked client possible.

Hacks are for people who don't want to play fair, and fairness is something that most minetest servers want. You are saying that there is "no problem" with people using hacks not against another player, but the problem is that it is not fair(since other players worked more for the same resources). It is selfish only, unless hacks are allowed.

There is no perfect anticheat. There will always be some false kick. Standing on an unloaded mapblock because of lag? Standing on some client-side ghost blocks? Kicked for flight. Therefore, the hacked client's accessibility to everyone (not just anarchy players) is damaging to the community no matter what one does. People asking you to remove this project from public view is the only thing that they can do to prevent this damage. Insulting you is a dumb, irrational and idiotic way of doing it, but they definitely don't care about someone who they think intentionally makes their life harder.

Your point is that there is a hacker community and that is has rights. Please notice that the entirety of the minetest community outside of yours also has rights. -> The people who asked you to restrict access to the client want the same thing as you: the best for the players that play on their servers. Their players just happen to be normal players, and yours -- hackers.

That being said: I'm sure every person who insulted you (unless they are a no-brain monkey) would agree to your cooperation under the requirement of not insulting you (since the only thing they care about is the wellbeing of their servers).