Max bet rule
A bonus rule ("mise maximale") that caps each bet while you wager, often 5 $ a spin or 10% of the bonus. Break it and you can lose your winnings.
Almost every bonus comes with a max bet (mise maximale) while you're working through wagering. Something like 5 $ per spin, or 10% of your bonus. Go over and that bet might not count, and plenty of casinos can wipe your bonus and everything you won from it.
The rule that burns people
Look at player complaints about winnings being taken away and this one comes up all the time. Some games let you bump your bet up with zero warning, so one slip is enough.
Real-life example
You've got a 200 $ bonus with a 5 $ max bet. Late at night you hit the bet button one too many times, spin at 10 $, and win 400 $. When you try to cash out, the casino goes through your history, spots that 10 $ spin, and takes back the bonus plus the winnings.
Stay safe
- Find the max bet before your first spin and keep every bet under it.
- Check if bonus buys or double-or-nothing features count as bets.
- Not sure? Ask support in writing and keep their answer.