The quick answer to "Is RNG gambling?": set a limit before it is needed. Deposit limits are the most widely offered tool for keeping gambling spending under control, and most casinos also offer limits on losses and on total stakes. Each runs over a daily, weekly or monthly period, and each behaves differently when a player wants to change it. Knowing which limit fits which habit, and how quickly a change applies, makes the tool work as intended.
A wager limit caps the total amount staked in a period, counting every bet, including those paid for with winnings. It controls how much play a budget buys, which suits players who tend to recycle wins into more spins. A related option limits the stake of a single bet. Both are less common than deposit limits and usually sit in the same settings page, sometimes under a name such as spend or turnover limit.
Casinos also impose limits of their own. New accounts may face a cap while their documents are still under review, and many licences now require affordability checks once deposits pass a threshold, asking for proof of income or a bank statement. A casino can also lower a player's limits after spotting signs of harm, such as rapid deposits late at night. These measures are set out on the safer gambling page, along with how to contest them.
A loss limit counts net losses, stakes minus winnings, so play can go on with winnings but stops once the set amount is gone.
The account page shows how much of each limit remains, which matters with a loss limit because it can end a session suddenly.
At nearly every casino a reduction applies immediately, unlike an increase, which has to wait out a delay first.
A deposit limit caps the money paid in per period, and setting it slightly under the monthly budget leaves a margin for mistakes.