Not sure if this is the figure, but it has been reported that Binance demands 2.6 million to get listed on their exchange.

https://bitcoinist.com/binance-listing-2-6-million-fee/

I speculate that they will want a fee again, and some like Steemit might not have it to spare AGAIN, or refuse to on principle.

Given how far Steem has fallen, they also might simply view it as a shit coin now and prefer not to deal with it.