Hate to say like this, but Altex exchange is likely greedy one.
Don't mistake common sense for greed. Dumping a coin with Zero volume, 51% attacks and broken nodes is not greed..... its running a business.
you also left out that ETNX added a SECOND premine on one of their forks... they literally paid themselves a second time after selling off all their original coins, it doesn't get anymore scam than that, thats why they got removed...
P.S. they claim it was asked by them to prevent any exchange to exchange manipulation, how can you manipulate the lowest possible trade of 0.00000001 btc lol, seriously they just keep making up excuse after excuse...