Scams are everywhere and it's very easy to implement a project scam in the cryptocurrency world because it is being done on the internet. The Internet can be used as a tool of scamming people especially when people get attracted to profit. Since then, I encountered a lot of scam projects for not paying the bounty hunters or the participants of the said project. I also participated in debunking a scam project to its lack of proof of legitimacy.
It's a big issue and very hard to be solved since it's being done globally and we can't control it instantly.
It would not have been a difficult thing to control if it was just done over the internet, but the extra security of anonymity attached to blockchain makes it very difficult for them to be known. Its control is really going to be a very difficult one but if governments are willing to adopt and legalize it, they can still control it to some extent.
Most scam are still done via ICOs for now, government can start from there by legalizing it and registering companies that wished to operate using blockchain technology and cryptocurrency, so no project that does not have the stamp of government like the STO should be participated in, there are some situation in the cryptocurrency where the issue of anonymity has to be jettisoned, any ICO that wants to carry out crowd funding, should be ready to face the government.