I think there are more than five risks involved with using bitcoin, there is also the "risk of the unknown" - imagine the possibility of a disaster that took down technology, electrical grids and the internet world wide, there’d be no way to access your bitcoin?

Also, there is the risk of investment-
Investing in bitcoin is the greatest risk of all because unlike the futures markets traded on the exchanges, disputes can be easily resolved because they are regulated. However, the reverse is the case when you enter the world of cryptocurrencies. It is both unregulated and decentralized. Anything can happen both gain and loss.

In all, one has to make up his or her mind to accept the risk involved, because without risks there are no rewards.