Most of them don’t check the IP, it would seem. Google acquires new IPs all the time, plus there are a lot of other search systems that news publishers don’t want to accidentally miss out on. It’s mostly just client side JS hiding the content after a time delay or other techniques like that. I think the proportion of the population using these addons is so low, it would cost more in lost SEO for news publishers to restrict crawling to a subset of IPs.
Most of them don’t check the IP, it would seem. Google acquires new IPs all the time, plus there are a lot of other search systems that news publishers don’t want to accidentally miss out on. It’s mostly just client side JS hiding the content after a time delay or other techniques like that. I think the proportion of the population using these addons is so low, it would cost more in lost SEO for news publishers to restrict crawling to a subset of IPs.