Because most cryptocurrencies can do what Bitcoin does at a faster, cheaper, and more scalable way.
While Bitcoin is one of the few “Decentralized” Development coins, it’s marginal advantage, and utility has been slowly corroded by corporate interests, as time continues on Bitcoin has become Fiat 2.0.
It’s losing its purpose as a medium of exchange.
It’s now become a greater fool theory speculation machine, & a banking collateralization mechanism.
Everyone who’s serious about Bitcoin knows its real intrinsic value as a medium of exchange is $30,000 + appreciation from inflation.
That’s just my thoughts.