For me its bitcoin that is more risky because its in digital form and hackers are very active about learning how to hacked accounts and hardware wallets. They are much improved as technology upgrading. But bitcoin is much more profitable ten times than the bank and its decentralized.
Every investment is risky but I think what is riskier is bitcoin investment. Market fluctuations here is so aggressive. The market price pumps and dumps almost everyday. Also I agree with the statement above, online transactions are prone to hackers.
I too agree with that bitcoin is more risky then compared to bank investment, as we all know bitcoin is more volatile so chances of profit and loss is quite common in bitcoin. But bank investment are more likely safe because in fixed deposit no question of loss and even in other types of deposits.