The Dark Side Of Decentralized World

Too much anonymity
Cryptocurrencies like Monero, ZCash and soon Ether offer nearly untraceable anonymity features for its users. This is great because many people prefer to keep their transactions private.
But anonymity is not only used for payments. An increasing number of Internet users are making use of strong encryption protocols, VPN’s and onion routing. Users that are active on platforms like 4chan or Reddit will have probably noticed how anonymity empowers the very worst among us.

The cryptocurrency market can be manipulated

The total market cap of all cryptocurrencies combined sits now at around $90 bln
The top 315 Bitcoin addresses own a 25 percent of all circulating coins. This makes market manipulation an actual threat.
source cointelegraph.com