Can someone please tell me why this good altcoins are getting delisted from bitone exchange?is there any other reasons why coins always get delisted while they have good volume?

I'm confused because quantstamp and status aint bad at all,they have good marketcap and good volumes
I checked coinmarketcap and discovered that most of the coins listed are going downtrend. As a matter of fact, they had their all time low this month of August, 2019. For instance, the all time low of mainframe was yesterday 17th August as at the time I making this post. Even if Bit one had seen this coming, it should not be enough reason to delist it.
Why are we even talking about Bitone? Bitone is not listed on CoinMarketCap, therefore, it is not a prominent exchange. There are so many prominent exchanges on which the coins are listed. So delisting then should not mean anything to anyone.