An AI company making money off of the work of others. Par for the course.

Must be some Terms-of-Services on the websites mentioned, that forbid this kind of thing, right?

It's not like the company hired 1000s of workers (each individually agreeing to YT's ToS) and have them dial model weights up & down.

Is the full training code uploaded somewhere for educational purposes?

what else can you expect from these sort of companies