I'm not sure why you think this is a legal grey area. If you have a clause that says no other employment... and you have other employment, that is not very grey. Especially if one of them comes with FAANG compensation, the courts will hardly buy an argument that you were not compensated for that limitation.

IANAL, so I could be totally wrong, but this does not seem grey at all. You broke a contract. The question would be about consequences, not the contract.