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.
Initially Bitcoin was created as a medium for digital financial payments. Then over time, Bitcoin is now more widely used as an investment.
Bitcoin price movements that are fast enough and have fluctuations are a reason for investors.
They take advantage of the situation to get a chance to reach margins from selling and buying.