[starspangled]

Not a lot of their profits. A minuscule fraction of their profits, and far less than OSS has given value to them. And the value from contributing back to open source is generally pretty high by itself because you get a lot of review and maintenance from the community on the features and code you want for your proprietary business, so it's not like they are doing a lot of it out of pure altruism.

OSS would be fine without Google, it was great before Google ever existed. There are intrinsic motivations to contribute, which is why thousands of companies do.