Is there a max bet during a deposit bonus?
Yes.
4.12. The maximum permitted bet amount while a bonus is pending or actively being turned over is $5 USD.
During a wager or a deposit bonus the max bet allowed is of 5$, any single bet over that amount will void your bonus.
⚠️ Please note that this is just an article talking about the deposit bonus, and it is not the final rule maker and it can get outdated. You should always read the TOS of the rollover for the latest rules.