So is happening due to pressure is getting higher on bsc network. People are shifting on bsc network aggressively instead of/along with eth chain but i like the way how bsc manages their fee service in the comparison of eth. Because eth takes $25+ for erc20 tokens transactions & bnb takes 0.46 to 0.60 cent max for bep20 transactions. Eth token swap is killing cause sometimes need $200+,, while swap can be done on pancakeswap less than $1 with fast transaction.
Comparison of gas fees between eth and bsc networks is very different, but users of the ETH network are still dominant and do not completely switch to other networks, currently gwei transactions are never stable and sometimes drop to 40 gwei so it is cheaper to pay for transactions on Uniswap.