Well, it doesn’t work. And we have an open topic about that issue.
But when it works AI uses too many words but that is in its nature. But captions aren’t for ordinary users and for them such data is only noise. It would be wonderful if those would be hidden somehow, because I don’t see alt-text normally.
Otherwise — captioning is just another way to give better accessibility and as long it doesn’t eat all funds and works on background everything is fine.