You should be aware that much of the effort of some big players like oracle and even microsoft goes into Linux. I am not aware of how this is for other FOSS projects but I would assume many companies have embraced open source. This may not be out of the goodness of their hearts but they definitely pour a lot of effort into these ojects and I think that is the beauty of FOSS, but also the beauty of the free market.
I thought AWS is built on hosting open source projects too.
I believe many open source projects that are used by large corporations find a way to make money with that, at least by offering support or consulting or with sponsorships.
There are volunteer projects of which the developer doesn't profit of but are used by corporations but I doubt they are the "largest" transfer as written in the post.
Every time I see this meme format, my brain plays a clip of "But you don't have to take my word for it."
Take a look, it's in a book...
lemmy corporate apologist mode engaged