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
Checking all the coins that are going to be delisted, these are all good coins but they all did not satisfy the requirements of the exchanges, maybe they have volume and support on other exchanges, but not no ton that exchange and they have to give way so they can accommodate new coins that are coming in.