In brief, bittrex delisted it because of lack of development. Dev sent them a video of torrent functionality and said that he is going to "release quite a lot of stuff after this coming client". Is torrent functionality going to be included in this next client? I don't know.

He also said that it's a lot of work to code it from scratch and they also have full-time jobs. They wanted to release new client few months ago but they found a major bug which is causing client to crash.