It's very easy for a site to detect if a user is using an ad blocker. There are tons and tons of possible ways to check. Since it's like playing whack-a-mole,

It's very easy for a site to detect if a user is using an ad blocker. There are tons and tons of possible ways to check. Since it's like playing whack-a-mole, I think most ad blockers simply don't care if their presence is known.