I think this is one of the reasons that any such activity needs to be underpinned by strong principles around a presumption in favour of publication of the open data, because that helps build trust in the idea that nothing adverse is happening through the centralization.
The other thing I would just observe is that open data has actually been the underpinning of a shared research base for hundreds of years. This open research agenda is very much in the spirit that research has been going on for centuries, and I know that a number of countries are looking at this, including my own. But I think it's still an open discussion with no concrete conclusions yet as to how to make sure that publicly funded research is open by default.