Free drinks at casinos are a long-standing tradition that many casinos still practice. It has been a common feature from casinos to gamblers that may have originated in Las Vegas. But it is used in many casinos worldwide.

Yes, depending on where you are. At most casinos I have been to in the US well alcohol and cheap beer is free  as long as you are gambling. It is the US so you are still expected to tip the servers.

As we've established, you don't pay any of your own money up front to get access to a no deposit bonus. Instead, players accrue credit with the casino by playing eligible games and wagering money on them. How this works is that casinos will ask you to wager a certain value of the no deposit bonus in order to get it.