I call those bot-only web pages.

Most of the time a web page reports an error or seems to be down, or it gives you another captcha no matter how many times you correctly answer it, it's just denying you access, but it's also trying to hide that from you. Whether there's captchas or an outright denial, those pages are guarded by bots that only allow other bots to proceed to the page. We've known for several years that captchas only deter humans (https://www.newscientist.com/article/2384228-bots-are-better...) so clearly anyone currently using them doesn't want humans visiting the page.

Most of the time, the Gemini summary that Google includes in their search results isn't particularly useful, but extracting data from those bot-only pages is one thing it excels at. So, whenever a search result links to a page guarded by a bot, and it senses that I am a human and denies access, I go back to the Google search results page, and ask Gemini to scrape the page and provide the data I want from it.