I don't think that is true. Any agreement you have with google/faang is your agreement and your punishment. You cannot bind others into the agreement. They face no legal implications.
For most US jurisdictions, intent is required on the part of the obstructing party, but in a minority of jurisdictions, negligence is enough.
I suspect this is why there's a clause in most employment agreements that I've signed, where the employee has to represent that they are free to enter into the agreement.