Auto-generated captions (something I deal with on a regular basis as I do create video courses) tend to be horrendously bad in quality even on major platforms. Especially with tech content (even if you talk crystal clear).
Auto-generated captions that came out bad leaves both the reader wondering what "jean kids" means when you really said "jenkins" and it also de-values the content creator's brand because now you think "how did such crappy captions make their way into this video?".
Now with that said, I'm all for providing human created / vetted captions that are accurate, but that should be up to the content creator to decide.
The platform should never step in and create new content based off your copyright content in a format that you didn't explicitly release.