As you have noticed, "Github for Data" is not what they're building. At all.
Our company is actually building Git for Data and Github for Data. We have an open source database called Dolt which combines the commit graph of git with the relational tables and SQL of MySQL:
Dolt lets you version, branch, and merge your dataset so that you can collaborate on it with others. Dolthub lets you share your dataset with the world, submit PRs, fork other people's repos, and lots of other analogous features to Github.
Our company is actually building Git for Data and Github for Data. We have an open source database called Dolt which combines the commit graph of git with the relational tables and SQL of MySQL:
https://github.com/liquidata-inc/dolt/
Then we have a DoltHub, which is Github for data:
https://www.dolthub.com/
Dolt lets you version, branch, and merge your dataset so that you can collaborate on it with others. Dolthub lets you share your dataset with the world, submit PRs, fork other people's repos, and lots of other analogous features to Github.