Crypto currency is ideal for scammers. It is great interest, everyone talks about this, while only a few really understand how it all works. People perceive bitcoins (and other crypto currency) as a way of quick and easy money earning.
And for scammers this is an ideal environment and a way to quickly cash in. On the Internet you can find a huge number of different schemes of fraud (from scams with ICO to fake wallets and fake exchanges). And every day there is something new. You must constantly monitor news and analyze information.
All these schemes are designed for banal greed, belief in the fact that you can quickly and easily earn a lot of money, etc.
It seems to me that a universal way of protection is common sense and logic. If you do not see the material benefits for the other side, then these relations are manipulative. If someone offer you too much and very quickly - it's a trap.