If I want to send few mBTC from my casino account to someone else who is using same casino, I would like to do it free and quicker if possible.
As far as I know, there is a
"tip" button on some of the casino I know specifically Roobet and Duelbits. I am not pretty sure though because I am away from keyboard but I clearly remember it having this function.
It's like an
off-chain transaction that costs no transaction fee between the same casino.
On primedice, stake, wolfbet and many other casinos that I visited and tried, they also have this function. This is widespread already because they also see its usefulness especially if a gambling site is kinda social based where they have chats and forum features because we can usually build a friendship there.
We can help someone that are in need of our help and they can also help us out when we are bored and have no funds to play at the moment and yes this function is totally free and they usually have lower minimum. Sometimes the casino itself uses the same function to tip players when they win some of their contests and promotions.