1. lack of knowledge of some people about crypto currencies
2. many negative issues about crypto currencies
3. Price fluctuations that are too high and too fast so that the risk that can be experienced is very large.
We agree with BABARIAN commenting on a 2nd key issue: PRICE FLUCTUATIONS
In our startup, we are developing mechanisms for token economics to remain stable
This is a trending topic as u can see on the crypto news since April 2018 approx.