in the rye on Nostr: web ads are often displayed in places that are unrelated to posts or a page because ...

web ads are often displayed in places that are unrelated to posts or a page because they are based on the user
for some time now, half or more of x (twitter)'s ads have been displayed in threads of posts that are somewhat related
since users see posts that interest them, this allows ads to be effective without retaining any user information

this is how advertising was done before the internet era