It is. But the reality of those sites is that for a guy the vast majority of your messages will never be read. You are shouting at the void and hoping for the best. This does not incentivize taking the time and psychological investment to write thoughtful messages, because you will send comparatively few and the lack of response is harder to deal with when you're more invested. It incentivizes sending the quickest messages that you care about the least to as many as possible. The guy didn't send her a dick pic, he sent every woman in a 50 mile radius the same dick pic hoping that with enough sheer volume he'll get a response.

It's basically spam that wants to fuck you, because non-spam options don't get you anywhere.