To access "free" content, some sites will ask you to "verify your age" or "create a free account" by entering credit card details or email addresses. These are almost exclusively phishing attempts to steal financial information.
If you are exploring these types of search results, you must prioritize your cybersecurity:
Because these links are frequently hosted on third-party forums or "tube" sites, they rarely lead directly to the content. Instead, users are often redirected through a series of "link shorteners" or "gateway" sites. The Risks of High-Volume File Searching