They are doing just pump and dump. Seing top 100 coin pumping just because of some exchange is like self circlejerking, you aren't reaching to bigger audience anymore, anyone who wanted to buy, arleady bought on other wide list of exchanges these coins are at. Being in top100 arleady should mean that you have working product and everything polished with that kind of marketcap which is rarerly a case if at all besides Steemit.