Since PoS schemes aim to create value out of nothing (cf. alchemy), surely they can decide to exclude whatever entities from the nothing ahem. value distribution if they want. There is no social contract that forces the creators to give shares to anybody. Most altcoins only give shares to the creators themselves and exclude all the others.

If we are aiming to have another social engineering fiat experiment, do as you wish and don't be surprised if nobody wants to hold your paper except (max) at gunpoint, as is the case with national fiats.