The Reach of the BSC chain is what makes it so popular, and why pay 6-7$ for a swap transaction on ETH when you can pay 0.09$ on Pancake Swap on Bsc.
From the developper stand point: We completely integrated the Bsc to our platform recently and it has been a real joy, Network is instant confirmation, as easy to program and integrate as (Bsc is actually a 100% copy of Ethereum).
In the end, customers like to have the experience at the lowest cost possible, there is no real advantage to the high fees charged by ETH, it just doesnt make sense that their fees are out of control like that, I had to pay 71.23$ the other day to transfer 10k, i mean... come on!, give us a breat, this is why we love cryptos, because it is supposed to be inexpensive. Trons fees for interexchange transactions are also quite high in compate to Bsc, like 8 times more at least.
Millions of miners can only cost too much to operate. It is not sustainable for the longevity of the crypto-space.