What difficulties will arise when developing a gambling service?

Question

Game development

I wanted to know in advance what difficulties will arise when developing a gambling site, when calculating the winner randomly, how the percentage of winnings is set in the casino settings and how to implement it, how to calculate the balance of the system with different amounts of replenishment, loss, how to start when it is unrealistic to get at first a lot of masses of players,
I would like first of all experienced developers who have already cooked in this topic.

Answer 1

The big difficulty is trust in your service. After all, you twist the chances on the server as you want. Where is the guarantee that you are not quietly spinning these chances towards increasing your income, thereby fooling gullible users?
This is not counting the legal complications.