If website you visits asks you to confirm that you are a human user from some 3rd party API isn't that same as requiring captcha?
You can still have browser extensions that filter the ads away after the website sends you the final HTML, right?
There might be ways to filter away the ads after they've been served, such as memory manipulation, but the problem can't be solved with a plugin anymore, as browser attestion could let websites deny you access altogether if you use a plugin they don't like.