No, but its unreasonable to assume that because they have an incentive they must be doing it. You seem to have seen a possibility and jumped from it being possible (but quite unlikely) to saying it must be true.
We all have incentives to rob, murder and rape people all the time. We generally don't do it though, and to assume that people are doing that is not a good thing.
State involvement creates a strong enough incentive to override all others against (mining revenue, ethics, etc)
This is a reasonable assumption when planning a POW change, since the only reason to do so would be in response to a 51% attack. Why bother otherwise?