It is not that Cryptocurrency are bad. Rather it is the people who fell thinking it is a good investment opportunity.
Because it ain't.
It is a currency. And a very volatile one. The prices of bitcoin ranged from $1 to $10000. This creates a wave in the economics. Because many naive people invest and lose money.
In addition, many false crypto-currency company emerges to fool unsuspecting investors.
It is one of the reasons ICO ads are being banned.
I believe in crypto-currencies. And I hope blockchain gets more usage as we go along.
Good luck to us..
When people get into this space with half knowledge they will surely have problems, people think it as a quick money making buck which is not the case. Eventually regulations will be in place and we will see more stability in crypto space