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> It’s worth noting how cloud vendors have fallen back on tried and true databases such as Postgres (mind you, often replacing the guts of those databases with new implementations.. but still).

Have they? Amazon created Aurora from scratch, with compatibility layers for different database engines (MySQL, Postgres), and GCP did the same with Spanner, which i wouldn't call "fallen back".

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Yes, that's true - those products are definitely more of trying to displace the open source tech by borrowing the interface. I still think it is a plain admission to the fact of the popularity of the original tech (e.g. MySQL and Postgres). For sure, credit due where it is due for implementing entirely new implementations - but it's such a common pattern to "borrow" the open source interfaces and reimplement the core engine.

That said, you didn't mention things like RDS or Google Cloud SQL, which are cloud-based versions of standard open source dbs.

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