As soon as the extension exists, the websites will remove the tags, no site is going to willingly let themselves be filtered out of Google results, etc for something entirely in their control

AI art in its current form is an incredibly new phenomenon, maybe about a year or two old tops. If openAI have admitted there's no reliable way to detect chatGPT output, AI art is equally inscrutable to automated filtering.

tl;dr the world has changed again, we adapt