The United States is only one of the many countries that Google and Facebook operate in. They have to follow the laws of the other countries as well, and they h

The United States is only one of the many countries that Google and Facebook operate in. They have to follow the laws of the other countries as well, and they have done so in the past. Furthermore, if humans are still able to recognize the ads as ads after they are not explicitly marked as ads, a perceptual ad-blocker might be able to detect them too. If the adtech companies modify the ads enough that the ads are indistinguishable from non-sponsored content, this xkcd applies: https://xkcd.com/810/ https://xkcd.com/810/.