Yeah they are already rich as hell so why would stake or primedice would want to get funding.
I mean look at the funding from other places, they do not get above couple thousand at most. Primedice is a place that has been around since forever and they got like couple bitcoins per wager for a long time while bitcoin was incredibly low priced as well, betting 10k on primedice was much different back in the day than today, it took hundreds of btc to do that. Which means they made so much money from those days that it worth incredibly more today.
They literally got scammed 2000 bitcoins from a seed hacker and still continued their way. They do not obviously need any funding at all because they have been making like a bank forever and what we can offer as a bankroll would be lower than what they have let alone be more than what they need.