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.
then to prevent the risk of many countries that prohibit the use of bitcoin, because there are still many countries that technology has not been adequate and can not monitor from the digital system, especially if there is fraud using scam sites way coin bits, the state apparatus is very difficult to detect , then for the users must be careful first and do not be too reckless of sweet promises on certain sites.