No one have the time to create subtitle, and engaging professional may be costly.
Bitch I lived through the anime fansub times of the early 00s. Sometimes the fans had the subs ready before the episode came out, and they were top notch quality, even with localization considerations. And they were doing it for free (if still for the cred). AI can only ever hope to have that sort of dedication.
Like, really, what kind of brainrot do you have? We've had internationalized captions and content decades before we had AI.