We've heard exchange getting hacked and millions of dollar worth crypto being stolen. 
Last year, Myetherwallet was exposed and hacker penetrated and stole alot.
Scam ICO made away with millions in recent years.
Crypto traders and investors are taking precautions so as to not fall victim. This doesn't guarantee Scam free Crypto space coz right now someone is being scam.

What could be the biggest Crime in cryptocurrency