This is really cool.

It reminds me of the #Edinburgh Decentralisation Index: an academically rigorous decentralization index that the university of Glasgow school of informatics devised to quanitfy the decentralization of cryptocurrencies:

The Edinburgh Decentralisation Index (EDI) studies blockchain decentralisation from first principles, archives relevant datasets, develops metrics, and offers a dashboard to track decentralisation trends over time and across systems.

informatics.ed.ac.uk/blockchain/edi

You should give it a serious look. IMO, it would offer some insight into academically peer-reviewed ways of quantifying this kind of thing.