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I don't know that is true. I would bet that Greenplum and EnterpriseDB have smaller marketshare, for example, than official PostgreSQL.



"It's complicated", and depends on a lot of factors: sometimes the equilibrium tips one way, and a vendor basically 'cleans up', ala Sun Microsystems and BSD Unix (the free ones took years to catch up). I think that is less likely to happen in this day and age, but it's a fascinating subject worthy of books, not merely a few comments on a thread.

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