If you will win they will take 5% from your winning and if you will loss you will loss 100% of your bet amount. So in both way casino will take some profit from you in a form of house edge.
No, they don't take anything from your winnings. House edge is just the statistical favour of them winning.
Freebitco.in still have really high house edge compared to what other casino offers around 1%.
Freebitco.in also gives away far more in faucet, bonuses, reward points and free lotto tickets, and has a more generous referral program. This is all funded from the house edge, you pay your money and take your choice as to which you prefer.