A general statement about market manipulation tactics:
Bittrex actively discourages any type of market manipulation, including pump groups. Consistent with our terms of service, we will suspend and close any accounts engaging in this type of activity and notify the appropriate authorities.
Does this mean ending of altcoin pump?

I wonder why still trading at bittrex if trading style like traditional forex market, maybe I misunderstood, sorry
This is weird. They accept new tokens to their exchange, they get money for the entrance, theiy are interested that this token is exchanged and the more the better,because they get money for any transaction, and then one day they say OK you play pump-and-dump with this token we don't want to get money for this.... What is trading anyway? It is a slow pump-and-dump. So if it is slow and supported by mass media bittrex is ok but if it is fast and supported by rumours and telegram channels then it is bad... weird