I'm still a bit dissappointed about CLOAK that was delisted. I underdstand the want to keep the best and strong with the best volume. You can't have hundreds of trading pairs, but I don't believe Binance listed them for a few bucks. They receive huge money for a listing and this keeps going. Harsh..
I am of believe that an exchange can do whatever it wants. It might be an unpopular opinion, but there is no legislation that prohibits exchanges from accepting payments for a listing.
People should do their own research and not blindly invest in anything they see. The moment people stop pumping money in shitcoins there will be no incentive for the projects behind them to pay $100-$500k for the listing.
Coins are mostly removed because of their low volumes, but low volume is an indication of there not being much interest in it, and in most cases the networks themselves for that reason are vulnerable to double spend attacks.