Where did you get that information? I'm not sure that's true.
I think Freebitco.in has 5% House Edge. Please correct me if I am wrong.
You don't believe me? Then check it out. Roll 10, 100, 1 000, 10 000 times, and then you will believe me.
How the House Edge could be bigger than 5%? I don't understand. The Hi-Lo game is provably fair, you can change your client seed for every roll while knowing the server seed hash. For 2.0 odds, winning ranges are 0-4750 and 5250-10000 then the RTP is 2.0 x 47.5%=95%