It's not easy to remove useless coins because sometimes many investors get stuck inside. The Investor wants to sell the coin but no buyer, so if in the Remove from the list, obviously will be many parties harmed.

But it's already a trash coin, of course, it won't be useful. I think this is the fault of the various exchanges because it does the selection with no good. So many projects are manipulating sales charts, so they can get in on the exchange.