Interesting to see SQL Server not listed here, am curious whether it didn't have enough signal, or suffered from being a two-word product, with "SQL" being far too generic on its own.
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There are some people here who are interested in corporate Europe or <insert Microsoft foothold place/industry here>, but most are aligned with Silicon Valley hackers.
Whereas something like Postgres has a plethora of forks and tools built around it, because it's open source devs can actually do interesting things to solve their problems.