Is there actually something more to go on than a vague "Legal Implications" why she can't stream. Not saying she's lying, but maybe I'm just too skeptical and don't trust people easily to make that assumption.
I remember this isn't the first time people have made the claim about non-compete clauses in contracts, though it's always been a circumstantial claim, as far as I know. I didn't see a clip from kson saying she had to wait to join Vshojo, it seemed more like by the time she decided to join a major event was near so they held off.
Also all the vtubers I've seen graduate or get terminated are pretty much steaming within a week, shit even the people from a literal black company Wactor, haven't had issues getting back to streaming after leaving.
I really don't care enough about this particular situation, but find it interesting people are jumping on the "Company Evil" bandwagon instantly.