The worst part is that they really restrict what clients you can use.

" there are some clients that are banned and some that may not work. Presently clients confirmed to work well with a tracker are qBittorrent 4.1.x, 4.2.1, Deluge v1/v2, rTorrent/ruTorrent, Transmission, uTorrent 2.2.1 (Build 25302), Tixati v2.77. You are advised to avoid brand new versions as well as any experimental or beta versions of clients, as they often are buggy and may not report your stats correctly. All ADC seedbox clients are optimized to work with our tracker."

I guess they really want you to get a seedbox from them.