First of all, the altcoin market is a stagnant market, the cake is only so big, and there are off-market participants constantly taking a slice, cutting the cake and not returning to build, leading to continuous market shrinkage. Second, Bitcoin and altcoins are not in the same market; Bitcoin has off-market funding support, consensus keeps reverting, when it drops there are funds buying in, the underlying flow is from the wallets of those who need Bitcoin to provide liquidity to the wallets of those who do not need Bitcoin to provide liquidity.