Reason behind crypto currency criticism

There are a group of people whose aim is to demotivate people in any respect whether to earn money. Everything has two aspects 1) positive 2)

I know that Cryptocurrency has flaws and crypto is used in many negative activities on the other hand many students earn crypto pay their educational dues, fulfill their positive dreams and foundation of their houses is lead by money that they earned from BTC.

So do not criticised cryptosystem at all it has 95% positive aspects and 5% negative and these 5% are mostly myths