People aren't investing in bitcoin because it's currency of the future.In some parts of the world, bitcoin is still a more efficient and cheaper way to transfer money across borders, and several remittance startups make use of this feature. Bitcoin's cost and speed advantages, though, are being eroded as traditional channels improve (and the network's fees continue to increase), and liquidity remains a problem in many countries.
I think they believe the biggest opportunity to buy bitcoin can start from now because in the future they believe the value of bitcoin will be more valuable.
bitcoin is increasingly recognized by big investors and middle-class society as a promising form of investment assets, many people who believe investing in bitcoin can generate greater profits if they are used as a form of long-term investment assets.