You've mentioned two of the main gripes with AviTron. To make it more clearly:
One, AviTron had some very content-greedy users. Either not exactly few of them, or each of them had lots of alts. They came into grids and immediately started copybotting whole sims, one by one. When they were done with one sim, they went to the next one and copybotted it. They didn't shy away from teleporting to on-going events, not even greeting anyone and copybotting the event sim, along with the inventories of all present avatars. Some went as far as copybotting whole sims into OARs and installing them on their own land as "their own" builds.
Two, AviTron had and probably still has users who sell content for real money which they aren't allowed to sell. This includes commercial content stolen from Second Life, probably as well as original OpenSim creations which are under an explicitly non-commercial license and original OpenSim creations which they weren't even allowed to obtain.
Alex' reaction, in both cases, wasn't, "This is illegal on AviTron, I'm going to investigate," it was rather, "This is illegal on AviTron, thus, it doesn't happen."
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