Binance.US has 3% higher prices on ETH, BTC, and BNB compared to CB. What is happening?

I understand that exchanges all have different prices for coins, but I've never seen such a large difference between these two. Right now, ETH is $1,850 on Coinbase, but it's $1,912 on Binance.US. BTC is 28,200 on Coinbase and 29,200 on Binance.us. Even BNB has a 3% difference. What is stopping everyone from making an easy 3% profit in the time it takes the network to validate transactions? Liquidity seems pretty solid on all three of these very popular high cap coins. Are network fees that insane where arbitrage is no longer fruitful? I can't imagine that because Binance.us allows L2 networks for transferring ETH, and 3% is a pretty hefty profit if you can keep going back and forth between exchanges. This has been like this all weekend. If Tether was $1.03, I know it wouldn't last an entire weekend. <edit> Omg, I didn't even notice USDT Is $1.03 USD. the US dollar is depegging.