Aside from some major examples, like most of the big tech companies funding the Linux kernel and maybe the Rust and/or Python Foundations in decent numbers, for the most part, corporations don't pay for open-source. That's why they love it so much: it costs ~$0, but generates immense business value for them (in that they don't have to write, debug, or maintain any of that, often essential, code or infra).

I can think of maybe three exceptions my entire career, and none of them were especially huge contributions.