To be honest, given they can't even get a blacklist function right, I don't even want to know how bad their anti-cheat will be.. Regardless of whether they elect to go for in-house or third-party.

and frankly, anti-cheat wouldn't solve this specific case, and not only that it would be at a serious loss to the game, and the developers know that they stand to actually gain very little from it, and much more to lose.