So generous!
The FAANG etc failed me for anything open source sponsorship related.
Their business depends on it, they made a fortune out of it, yet they donate little or nothing to it, or worse, they forked it and was reluctant to upstream anything.
pick Amazon randomly, it went from exploiting to rip-off in my opinion, thanks to its boss , who sails on a luxury yacht and asks all his employees to be frugal. they all look similar to me as far as supporting OSS goes.
> yet they donate little or nothing to it,
It is all about knowing individual engineers inside these companies. Nearly any engineer in FAANG can, with a little effort, donate their own work time to an opensource project in the form of submitting patches.
The project can help in various ways. Make sure licensing stuff is in place so that whatever IP review process the company has goes smoothly. Make sure PR's are reviewed fast. Delegate responsibility ('hi, would you like to be maintainer of this feature?'). Make sure contributions are publicly recognised (ie. Public page of maintainers/biggest contributors).
Remember that most engineers inside big companies are trying to generate good content for their performance review. "Wrote and open source some code" is usually one of the checkboxes.
Typically FAANGs have a clause that they own everything that you code even outside of working hours.
Meta has its own production fork of CPython, Cinder: