Because there are people within the company who are in league with them.
There is no other answer, neither logically nor if you take one honest look at the history of the Square-Enix MMO's and what it has literally taken to get even a remote punishment on that level of player.
The last time they really took action against players who did this kind of stuff on any realistic level, it GUTTED endgame on XI and became a historically bad move for SE because of the number of players who openly embraced these illegal conducts, up to and including account-selling -- isn't that right, Order of the Blue Gartr?
Have you figured it out yet? They've got someone buddy-buddy with them, and I can name him by name if the guy I suspect is still with the North American Community Team. (Which is one of the reasons nothing here is going to get back to SE Japan on the subject -- which is the only way things get changed, but what happens when they do and the entire top level of the game goes with the RMT and the like?)
And I don't think that person is alone. What happened is that the community of the game has become far more important than even the law surrounding it. So much so that Square-Enix actually got sued by an ex-player and WON, and the decision stated that there was no obligation on their or anyone else's part to enforce ANY ToS!! (I believe that was Leung vs. Square-Enix, IIRC.)
This company, especially on the NA side, has been in league with the cheaters and encouraging the cheaters for a decade and a half now. And anyone who's paying attention can see this. It's one of the reasons I think this is my... FOURTH? go-around -- and that the only reason I am doing so is because of the COVID-19 stay-at-home orders and the like... And if they found out who I was by name, they could probably ban me immediately.
And that's the goal of RMT, the botters, the third party program types, etc.: To control the content so you have to go through them to actually play the game. And now with the ToS making Obstruction (of any kind and of ambiguous nature) illegal, you now could have the situation that, if they have the backing of the community, it could be legal not only by default, but by DEMAND, and if you don't, you are holding back the future of FFXIV -- something I've been accused of in each of my previous MMO tours here.

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