I wish there was an effective way.

[pangmida]

You have no choice but to drop a drone strike on their residences.

 

[CinnaSloth]

I think every writer should have this on their front page, or something to this extent:
"I charge an upfront licensing fee, to use, or adapt my work if you come to me first for commissioning."

 

[ConansWitchBaby]

The site admin should allow us to get their address so we can send them a bowtie pipe bomb in the mail.

 

[McPhoenixDavid]

Might be worth contacting them, pretending to fall for their scam, and asking for their PayPal, only to report them to PayPal, and hopefully get their accounts locked.

I don't know what it takes to nuke a PayPal account, but even if you have to lie, just nuke it.

...

That seems promising. Might be a good way to bring color in my monochrome life...hehe.