Started blocking catfish accounts, then they were suddenly all blocked

I went on yandex reverse image search and started loading pics of women trying to talk to me here.... first one did it when I first joined and hadn't even finished doing my profile yet, asking me how I found this site. Then it was just akwtchy conversations from not outrageously attractive but attractive enough girls just messaging me everyday.

So I started reporting them working my way down from most recent to oldest and blocking them, and suddenly all were blocked. Does this mean they link their accounts and if you block a few they are all blocked?

Why would someone waste their time on doing this? I'm not giving momey out or anything. Chances of someone here being in my city is very low, so I'm not expecting anything other than a couple online friends who I'll never meet. I'm not seeing the point of a non-financial exploitive catfish.