How much red streak can in a row with 90% chance
Infinite , since there will be a chance to everything. You can check here for the probability of its happening
http://dicesites.com/tools90 % chance to win doesnt mean that you will only lose once every 10 rolls. It could be 10 loses in 10 rolls as well although the chances for it to happen are close to zero it's working nice for me to other dice sites PD, Dadice and Safedice,
Unfortunately there is nothing to be done here if you think this is rigged then you have to take your complain to Ryan here
https://bitcointalk.org/index.php?topic=1020726.0 . Owner of the site which uses moneypot's API has zero control to the outcome of the roll and only Ryan has a control over it.
Even if the site owner wanted to tamper the bet result, fake a data regarding number of rolls or
BTC wagered , they couldnt do it because they have zero control over it. Short words, you are getting into bad luck