(Replying to PARENT post)

You're asserting that they have forked OSS and then not provided back the source code for their own improvements.

I guess we can check their github repos to see if that's the case.

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(Replying to PARENT post)

As far as I know DocumentDB is closed source. Btw: I can name zero OSS projects from Amazon and this is not the same for Microsoft (VScode, TS) and FB (React, Jest).
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(Replying to PARENT post)

For some companies there are some (very partial) statistics, for instance: https://www.openhub.net/orgs/Google
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