At the end of the day Binance is primarily an altcoin exchange and whatever happens to it should affect the altcoin market significantly not bitcoin's. But realistically speaking the FUD always finds its way to the bitcoin market and affects the weak hands hence causing the drops like we've seen too many times in the past.
Besides, what SEC does to Binance is not the issue here, what the FUD is going to be and how it will affect the market is the only thing that matters.
I just want to say that bitcoin is the most traded coin on Binance. I checked spot trading for bitcoin, ether and Binance coin on Binance, Binance coin is not near the trading volume of ether, while bitcoin trading volume is higher than ether which I think is the second most traded coin on Binance.
Let me use yesterday trading volume as examples:
Using bitcoin price of $26770
Ether price of $1818
Spot market:
BTC/USDT: 65805 = $1.76 billion
ETH/USDT: 555361 = $1 billion
USDT-M futures:
BTCUSDT: 700502 = $18.75 billion
ETHUSDT: 4260000 = $7.74 billion
Coin-M:
BTCUSD: 111834 = $2.99 billion
ETHUSD: 714927 = $1.3 billion
Binance coin is very low. Also other coins are lower to both bitcoin and ether, but ether is still almost 2 times or more than 2 times lower in trading volume than bitcoin on Binance. Binance is truly an altcoin exchange as it encourages many altcoins, but bitcoin is the most traded coin on the exchange.
What is affecting the crypto market is also affecting bitcoin too, but just that altcoins are more volatile and riskier.