So much pure scam projects nowadays that just fool and milk greedy investors. But there's even more semi-scam projects, which is even worse
https://scamstamp.comHere's one contract for anti-scamming. It works by sending false ERC20 tokens named SCAM_STAMP to the address that you want to mark as scam.
To mark an address with 1 SCAM_STAMP token cost 1 finney, if the scammer wants to lose these tokens they have to pay 10 finney per token which goes to the address (addresses) that marked it as scam.
so let's say you've sent 2 ether to some address that scammed you, you can send 0.2 ether to MarkAsScam function of the contract
https://etherscan.io/address/0x017a5d8d82afaa22bc29d75013d6ff3656e90851 which will send 200 SCAM_STAMP tokens to that address. In return, the scammer, if it wants to lose the tokens, they will have to pay 2 Ether (which will go to you) to lose those 200 SCAM_STAMP tokens (there's a 2% contract fee).
Also, before sending any ether to a contract, you could check this contract if that address was already marked as scam or not (that's free to do
)
edit: rebranded into SCAM_STAMP , sounds better