What about using BLOCK HOST?

I keep coming across spam files that at 134.4k... and they seem to be for searches that otherwise turn up nothing.

All of these files come from a few hosts that refuse to let you browse them. Is that the smoking gun we can use? Of course they can beat this by changing IPs just as they could a file-size filter.

There's no way to beat spammers but you can make them work harder LOL.