That is a negligible premine if intended to cover all future expenses.

What's the logic here?

I reserved 33% for $MM development to account for liquidity, market making and all production and operations related expenses. 10% of this is private founders fund. So the net % is something like 25% of supply.

10%, this is what dev can keep for private investment.

It's good for investors with 10% and the dollar value of this amount depends on price performance of new coin which we all hope will be excellent.

I presume that this information will be presented after launch.

It is better to over fund during first launch so that you don't need to dilute afterwards, but even listed stocks always dilute from time to time, certainly tech and biotech but even established companies. But this will be a non reissuable crypto.