It's basically a cheat menu. There are only two options with one giving you $10,000 per click and the second is to reset the church storyline if you wanted a different ending.
The stock market at stonks.ic. Buy low, sell high. All the prices run on a cycle, so it's pretty easy to figure out what's "low" and "high" for each stock if you pay attention.
I used the betting site when I unlocked it, I saved the game, bet all my money, and if I won I saved it on top of my save and if I lost I just louded the save