1. The hot wallet balance varies but generally large enough to cover high rollers
2. .05% I believe
3. 1% of the bankroll
I'm confused. AFAIK, the max win was equal to the house edge of the app he was betting at, in terms of percentage, with a cap of 20 BTC. (1% edge = 1% of bankroll). Is this still the case, or was the change made without an announcement? Also, a bit over a month ago, you accepted 0.01% edge bets, and I don't think an announcement was made about the change.
Is it possible to have a more precise answer regarding the hot wallet?
It's better to keep it hidden so hackers have to guess to whether it's worth it for not rather than knowing.