Do we really need a StateBook? https://newsocialist.org.uk/do-we-really-need-a-statebook/
The conclusion, with which I would agree, is: no. It would be centralised services just of another kind.
Good though to see a major political party recognising that the centralisation of the social graph with the big digital giants is not a good thing.
But a better solution is the support of open standards and protocols, and control and portability of data.