You probably don't need to worry about the guy starting a competing company. If he does it will fail.
Also remember that there's a lot a lawyer can do for you in a situation like this, way before a lawsuit is even on the horizon.
A rather useful institution for a society.
I think they may be better described as a referentless third person pronoun rather than a genderless one in a lot of circumstances. The genderlessness is more of a consequence of having no referent.
What's even odder is that Paul used "they" for the lawyer, apparently intending to be gender-neutral, but failed to notice that the OP had done similarly.
I don't mean to be making a huge deal out of this. It's just something we could probably all stand to be more aware of, myself included.