is it possible to host and control everything myself.
What you can do, is what betterbets.io does, and use the "confidential flow" (See: moneypot.com/api-docs ). It allows you a lot more control, as your run your own server, and can store what ever you want. Definitely a bit harder, but might be worth doing.
could you please ELI 5 what you understand under a true version of blackjack and what kind of blackjack would be possible to offer with MP thanks
The issue with a non-atomic game like blackjack, is that there is some information reveal in the middle which would mess with the investor system (they could invest during a bad hand, and divest in a good hand). So if you do want to use the MP bankroll, you need to a bet which has an instant resolution (e.g. roulette, plinko, dice) and doesn't leak intermediate state.
We're going to be supporting games like blackjack very soon, but they will have the caveat that you need to bring your own bankroll