My reasoning is fine. Discussion of illegal content, if we have to be completely pedantic. Which we don't.

The fediverse doesn't need to be a unitary blob - in fact, it shouldn't be a unitary blob. An instance could block any instance where the use of the letter "e" is allowed would be completely legitimate (though the number of federated instances would be limited).

Though they have no moral obligations whatsoever to do so, it's fair to expect Lemmy.world to have predictable rules and relatively stable policies as it is the most mainstream instance and has a bunch of users. And honestly, for the biggest, most mainstream instance, banning the discussion of piracy is pretty predictable. It's simply not the kind of thing joining the largest platform of the Threadiverse is good for.

If you don't like it, this is why this place is federated in the first place. It's literally like this by design. Just stop complaining and use some other instance instead, it costs you nothing.