Of course it can be rigged. Gambling is retarded. Why would you even gamble, if not for fun with cents?
You can gamble just for fun. I'm doing it, and it really is fun. There are websites like PrimeDice featuring faucets too, so you're getting free money to play with.
Not so much free. It is still your time. You also need to be lucky to win a nice amount. The faucet can upgrade but you must be a whale probably to do that. Still it is better than faucets that is for sure.