Investing in Bitcoin is not risk free especially to investors who do not invest appropriately with the right approach and strategy, and also not sticking to their investment plans (long-term).
I partially disagree with your statement as long term investment is not risk free. Investing in Bitcoin or other coins will definitely involve risk. If you are a professional investor then you are used to accepting risk as the price of any coin is not always the same but fluctuates constantly. We constantly monitor the market.
While investing involves risk, the level of risk involved in Bitcoin investing is relatively low. The risk level of Bitcoin investment is low because investors buy this coin and hold it for a long period of time. Investing in this manner requires you to plan to hold the investment for a long period of time if you want to earn enough profit.