Technically they have the right to shut down TR for whatever reasons they want, however they have never shown any desire to shut down any actual mods for SW games, even though they're aware of them- the EaW patches were authorized in large part because of mod popularity, for example. Calling Apeiron a mod is a pretty big stretch. It's far more like the old BFIII fangame that was being made which also got shut down a few years ago. They were remaking the game in an entirely different engine, calling it a remake, it was getting represented as such on gaming news sites, and even had apparently registered their team as an actual LLC. While they said it was something that would require having rhe base game installed, it's hard to say what form that would take, since again, it was being made in Unreal. I'm honestly surprised it took this long to get shut down.