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Lots of the money comes from the US and US companies. But as you said, it is open source.
US corporations donate to the Linux Foundation, and in fact all the Platinum members of the Linux Foundation (donors of $500k or more/year) are corporations - although I don’t think they’re all American. But the Linux Foundation has no control over the code, it merely promotes use of Linux. Did you mean something else by, “Lots of money comes from…”?
That was pretty much what I meant.