They're not really choosing to do that though. They are completely beholden to the out of sight conversation weekly with Apple that led to changes in how users can spend - especially funds that Apple gets less of a cut of, like Robux gift cards.
Another POV is that Roblox is overvalued and it's just a matter of time before the fragility of its business, which is being a time waster for kids, falls apart like everything else in that space.