Assuming this isn't Reddit, but just a bunch of users with AdNauseum installed, what do you expect them to do? Present a captcha before letting a user click through an ad?
The reason we have aggressive web advertising is because the web has no revenue model to pay website owners for their content costs. So I’ve wondered if the web would be better off with a Spotify-like model, where ISPs pay web hosts per page view (or how long time is spent on a page). If websites want to be eligible to receive these payments, they’d have to commit to having no ads, or at least very unobtrusive ads without any tracking. And line Spotify, consumers would continue to pay a flat rate, regardless of how many pages they visit (within their data cap)
I think the major web players are far too mature and entrenched to make such a major shift in the web’s revenue model. But if this had been implemented decades earlier, it might’ve had a shot at success.
Maybe not the kind where you need to solve puzzles explicitly, but a few months back I noticed they were running recaptcha enterprise on every page, presumably for anti-bot/fraud purposes. This would be consistent with the hn story a few months back which found that reddit was fingerprinting users through a company called "whiteops", also for anti-bot/fraud purposes.