Bot always sends the tips back to sender, minus fees if exchanged, or the same amount & currency if it wasn't exchanged for 2 hours. And Stake is aware of the bot, so it should be fine.
Do I miss that tipping is not an on-chain transaction and it is more like a credit to an account?
Later when a user submits a withdrawal request, the casino will check and approve it, then if the withdrawal request is accepted and proceeded, it's time for an actual on-chain transaction, then we will talk about transaction fee here.
I personally play on Stake as well with my personal account, and I've made it clear to Stake the bot will not claim any bonuses, has all promotion and rain etc. features turned off.
It's your good approach to keep your account safely.
What did cause you to name the bot like Poorbot, but not Richbot?