What he is saying is probably the existence of bitcoin, market volatility and how we will profit from investing in bitcoin. I don't think he's referring to the technology, how bitcoin works. The stock traders I know when they hear about bitcoin also quite easily grasp how to make a profit when investing in bitcoin, some are very excited and some are not very interested.
It is still hard to understand by someone with experience in stock markets only. It is easy to buy and sell and APY's are great! But do you still find it a good investment when you purchase Bitcoin and looking at it drop 50 percent in days? It is not like traditional stocks. Binance announces Bitcoin depozit freeze, Bitcoin goes down a slippery slope. Russia wants Bitcoin, it goes back up. China cracks down once again on Bitcoin, things go bad. A new strain of Covid makes it drop like a barbell to the floor. We do not even know what outcome it will have the next financial crisis.
Cryptocurrency markets are hard to predict and making a profit by trading requires a decent amount of knowledge. With stocks it is easier.
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Regards,
PrivacyG