if you go to each of those markets on Binance or even on Coinmarketcap you can see that these coins don't have enough volume to be considered profitable from the exchange's point of view.
for example if you change the time steps in the
https://coinmarketcap.com/currencies/bitshares/ page to 1 month you can see that excluding the recent dump of BTS, it was pretty much a dead market with little to no volume. and the recent dump is obviously caused by this news and people are panic selling this shitcoin to get rid of it prior to the delisting.
BTS is one of the oldest DEX in crypto. It used to have a good price and volume and since Larimer abandoned this project the community lost interest as well.
I went over to the list of tokens delisted and here are some reasons they said these tokens lack which same reason they were also delisting some tokens before 2020. Anything If they are not making money, they will remove the pair or worse the token.
people have always lost interest in altcoins after a while specially when they stop being pumped which makes them unprofitable for the altcoin traders.