This has tto be define by individual based on their perspectives. Bitcoin is a risks investment and not stable investment but there are ways to minimize your risk while you do your investment, and also, if you want o invest in Bitcoin ensure to invest what you can afford to lose. The reward of long-term investment is better than short-term.
Well, when people become serious about investment, the general view that people can realize that no investment is reliable, it always has certain risk numbers, and we can only accepted, too perfect is an impossible thing, and in addition, if we take the time to read more about bitcoin, it's not difficult to determine that it's an unstable investment. It sounds very dangerous but we should know the value of these investments, profit from this category can always change a person's life, poverty can become rich quickly, so, just to be reasonably safe, people will participate in bitcoin regardless of its hidden risks.