It is a big shock for altcoins because delisting from reputable exchange means instant 50% loss. And why exhcanges do that? Because they are regularly cleaning their market from coins that have low trading volume.
It's industry practice, and in the end, exchange always win, and coins and it's supporters always end up in the losing side, this what happens when investors are investing in a new coin or weak coins that cannot build support from a majority of investors, that's always been the case, we really need centralized exchange, to support coins with good promise but low volume.