I absolutely do not agree that cryptocurrencies are a threat. This is a new technology, this is the future of the economy and the whole world, just the existing system is not yet ready for it.
all investment are dangerous but its all up to you who you could trust. i think investing in crypto industry is also dangerous but you have to take the risk and trust crypto to make your investment increase. its all about money , so you just need to be careful because many people out their will do some stupid things just to make you in trouble so before talking to someone don't easily trust them because we don't know what their plan.