Many factors cause people to fear investing in bitcon.
1. Legality issues, bitcoin is still illegal in some countries.
2. Prone abused (hacking).
3. Very extreme price fluctuations
4. Many fraud mode, in 2015 there has been a case of fraud by a citizen of the United States named Trendon Shavers. He founded the Bitcoin stock exchange firm called Bitcoin Saving. Shaver was later found guilty of having cheated Ponzi schemes worth US $ 150 million.
5. Unclear tax rules