
Databricks announced the full open source of Delta
Zorder etc and more since the announcement https://www.databricks.com/blog/2022/06/30/open-sourcing-all-of-delta-lake.html
Apache as good model is highly questionable also… this is an old discussion (some important contributors even questioning the governance by some projects that prevented new commiters to maintain ratio etc).
Regarding interests pretty soon each vendor that is praising that is “open” will say “I have better functionalities” that’s how it works, some won’t ever contribute back…
So at the end we have two full open source projects, which is nice.