I could be wrong but I think that would first require legislation in all first world countries with some serious teeth to add headers or labels for any content that may be AI generated and then the browser updated to look for the header or label.

By serious teeth if a country contains a big platform that is not labeling correctly then after so many times they get fined millions then billions then sanctioned then embargoes after repeated offenses. Anything short of that in my opinion will be ignored as the cost of doing business.

Seriously...I would pay for web browsing, reddit, HackerNews, etc. to exclude all AI stuff. Thats more money than ive spent on AI products.

AI detection vs. "humanization" has been an arms race for some time and will continue so, for at least as long as students want to cheat on essay composition tests.

So any such blocking feature would produce both false positives and false negatives. Complicated by existence of pages that commingle organic human content (possibly plagiarized) along with AI slop.