Do you mean accepting cookies from other sites? They are usually disabled in modern browsers that accept only cookies from a site whose address is in the address bar, and not others.
The reason they were banned was because they became trivial to track users between collaborative websites, although the advantage provided by this ban is doubtful (there are also effective methods available).
Please note that the website may also determine a cookie that is larger than the current domain if it does not go to the top-level domain. For example, meta.stackoverflow.com can define a cookie that includes whatever.stackoverflow.com and even stackoverflow.com , but not example.com .