2. This cannot happen because afaik nobody is allowed to touch your chips, even if that one is with you/your friend. An I wrong?
Let's not confuse movies with reality.
It happens in real gambling in my country especially in the place where I live. Although the game is not the same as mentioned by OP but it is a bit similar. It is a game where players against the dealer. Players place bets and other players can move other's money to others or even take the money of other's players but they responsible for it. Means that if the taken money or moved money is a bet, the one who take or move it should pay the winning. Perhaps it is not happening in big and professional land based casino, but it is happening in traditional gambling in my area.
Below is the gambling game I'm referring to where players can touch (take/move) other's money:
It is very clear, traditional gambling and casino gambling have a difference that looks very contrasting. whether it's from game rules, security guarantees, playing comfort, the many types of games, and the most important thing is the purity of the game which tends to be controlled by the dealer.
I mean, traditional gambling like you show in this picture. I don't guarantee 100%, but in most cases bookies from traditional gambling tend to play unfairly with the various tricks they do. at least, that's what happened in my country. after all, most of this kind of gambling is no longer popular because of the sophistication of technology. Gradually, traditional gambling will disappear with time.
however, there is one thing that modern casinos and traditional gambling have in common, namely, in the end, the dealer always wins. the difference is, traditional bookies are more inclined to cheating tricks, but if in a modern casino, players don't know the time so the money at stake will gradually run out too. So, that's roughly the difference.