How plausible is this the reason why BTC is green and most alts red?

Fidelity announced institutional support for BTC buyers in a few weeks and the market is selling their alts to ride that bull market .

Past bull markets were spurred by retail investors using exchanges that supported many altcoins as well, and Fidelity will only support BTC

Institutional investors will only be buying Bitcoin. This bull market will be different than past bull markets

Or possibly a liquidity crunch on alts because Binance was shutdown for a week ?