I think you're understating this potential breach in law. This isn't a local law of some city in the world - it is a state law in the country these companies we

I think you're understating this potential breach in law. This isn't a local law of some city in the world - it is a state law in the country these companies were founded in. And it isn't some odd law that the company would easily forget about - FB and Google both get their revenue from advertising, and political advertising disclosure laws are pretty common. While Washington might have some stricter rules, I'd expect the companies to have a division working on compliance.