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.
not only caused by the low trading volume but the coin is also can't full fill all of the requirements that already made. polo is such an US exchange site which is following all of the order from the US regulator.
Those coins are getting delisted much more to be security token.
But it's not a big deal to still bet on the polo as the daily trade volume of poloniex is getting drained from time to the time too.
that means we can't get a huge volume from there as not so many traders and buyers on polo.
As long as we have still another and that's fine.