Yes but technically you are not making an entry in someone's database; you merely send a request and it is not your problem that the remote computer misinterpreted this as displaying an interest in an ad. Remote server doesn't use any password, SMS confirmation or similar measure to restrict the users that are authorized to send requests so sending it sould be 100% legal.

But as a proverb says, "the law is like a drawbar, you can bend it as you like".