When big boys enter the picture, the rule has changed. Bitcoin then becoming a fprm of investments, and no longer the original vision of satoshi, iguess its really inevitable, specially during the 2016-2017 when it peaked at around$20,000. It become a speculative asset, and others tske that as a opportunity, trying to make quick bucks, or even putting thier whole life-savings hoping to become rich.
Actually bitcoin some function, and one of them is to be a medium of investment. Right now, bitcoin for investment is more popular than to be a currency, it just because bitcoin as investment seems to be more promising than to be a currency. Beside that, many people is believe that in the future, when the price of bitcoin reach its peak, they can get maximum profit from that investment.