> But centralized bitcoin - is nonsense. We already have FED.

Not disagreeing here, but centralization and decentralization are not the only states possible.  They are two abstract ideal ends on a continuum.  A fully centralized system doesn't exist; centralization of information asymptotically approaches total singularity, and decentralization likewise approaches total entropy.

> I mean that all earnings in this system can be get only from the money from next members.

I believe what you are trying to make is a practical, moral observation about who benefits from Bitcoin's cash flows. But really this is necessarily true of any system that requires its participants to distinguish between the value of resources outside itself vs inside itself, and who must choose, based on this distinction, whether to move some of their own resources from outside to inside.