Is there any legal background against bit coin cheaters,who using scam sites for cheats people..
Yes you can file lawsuit against scammer. The problem is having a strong evidence to file against them because if not your filed case will be nothing. Scammers are hiding their identity using VPN and some app to become anonymous. Remember that we are in online and bitcoin is for anonymity transaction. It is hard to determined who are the real scammers.
But where you can complain about the scammers who is cheating since bitcoin and all altcoins being a decentralized currencies to use we cannot do anything with the scammers and hackers who are attacking the wallet.
Since static IP address can tracked the network line with the DORA process. That is not a big matter to find the people who using it and find the real static IP. If you check the people who using vpn plugs that will some companies IP usually.