But the act of "looking into their profile" is valuable to the spammer. You get an ad when you do that. So, it doesn't matter if you follow them or not. If you

But the act of "looking into their profile" is valuable to the spammer. You get an ad when you do that. So, it doesn't matter if you follow them or not. If you do follow them, of course, it means they have direct access to send you ads. If you don't because you viewed their profile, you at least saw one of their ads.