I am not sure how much is the total bankroll if we sum all the bankroll of each currency but I guess the bankroll will look bigger if they have less currencies.
Scroll down to the bottom of the main page you will find the site stats. According to it, the current total bankroll is $2179931.
1. There is not enough auto-delivery mode in the game - it seems to me that this is already a standard for dice, I play a lot of places and almost everywhere there is this option.
I agree, the game lacks many features such as auto-betting and advanced settings.
2. When receiving cryptocurrency from the tap, the page reloads and the game settings are reset, and the Server Seed Hash and Client Seed change.
This shouldn't happen and they have to fix it. The user must be made aware that the server seed and client seed've changed.
4. There are not enough statistics on the game screen. I would like to see how many bets are made, what is the winning, what is the loss, etc.
Not sure if this is what you're looking for but you can find more stats on this page:
https://multidice.io/resources/stats