I believed that binance strong foundation is the key of bnb coin success here, and with the ongoing pumps, many people attracted to this asset. Indeed it's been a tight rival of ethereum, which I think had an advantage because the transaction fee of their network hasn't increase compared to erc20. Binance using bsc network is doing well, and people never cried for bigger tx fees that's why it also contributes to the demand.
A little strange that Bitcoin right now is ATHing and even Ethereum itself is gaining from this super rally, but Binance and some other coins are actually losing over 10% from their ATH.
Guess people now seeing altcoin outflows back into Bitcoin and ETH now with the Berlin Upgrade. That does make a lot of sense with the market movement now.