And thanks TheQuin, I finally understand the system now. I knew this is very different from fixed odds sportsbet, but this is very, very different! Imagine if only 1 guy bet on the team B and 100 guys bet on team A! What's the commission on these? (again sorry if already explained)
It doesn't matter how many people bet on an outcome as only the amount they bet affects the amount in the prize pool. The prize pool is the sum of the amount bet on all the losing outcomes minus our 5% commission. In the event that more than 95% was bet on the winning outcome then we just reduce the house edge. We have only had 2 events where more than 95% was bet on one outcome so far and in both cases the longshot bet ended up being the winner. (Lesson: always bet on an England batting collapse when they are heavy favourites to win.

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just curious if anybody here developed a calculator to know the odds after X BTC is placed on a certain selection
as I remember someone in the past made something similar for onehash so would be great if there is a calculator for freebitcoin as well
I'm not sure what exactly you are trying to calculate. Can you give a bit more detail?