You would think so but tell that to anyone advertising to say, for instance, that Greta Thunberg is right or selling t-shirts insulting Trump and they'll be out

You would think so but tell that to anyone advertising to say, for instance, that Greta Thunberg is right or selling t-shirts insulting Trump and they'll be outraged--claiming that this is not political but essential. More generally, you would see a lot of people unwilling to provide documentation that they are not a 527, or a foreign entity.