Setting aside that there really shouldn't even be an anticheat in a PvE game (unless progression allows you to unlock items that are real world currency based on which I could see why they'd want to stop people from accessing it without one of their two methods)

I can think of another reason. It's a live service game where it's the community vs the game masters. They want to tell a story within the game and direct us with community challenges. Right now there's a challenge to protect planets from automaton invasions. We lost the first planet, won a few but it's not looking as much of a clearcut victory like the first challenge was. There's a real chance we fail this challenge and maybe that part of their plan?

So what would happen if you let cheaters run amok? Now you can't tell a story where the community fails, because cheaters can guarantee wins. If you make it so hard cheaters can't win you're going to make it completely impossible for the community and that's just not fun. So what can you do to make it fun for the community? Crack down on cheaters.

I just don't see another rational reason to have anticheat. Even the real world currency isn't that useful because it's mostly for buying armors for cosmetic purposes. There's really not much to gain from circumventing the real world currency.