juts skimmed it so fast and found these 2. loyalty program is not under development, its just not in existence. a simple "none" would make more sense.

as for the most common complaint, reading the forums, this appears to be inaccurate. by a lot.

Loyalty Program: Under development.
Most common Complaint: Freeplay rollovers are calculated by multiplying the winnings amounts rather than risk amount.

http://www.sportsbookreview.com/Reviews/BetOnline/