We've discussed this here before, but I bet the majority of companies are parasites. Heavy consumers of open source, with virtually 0 contributions of money or time. I think we should resolve, particularly those of us in a position to make it happen, to donate to open source projects.
I do (and I stay anonymous for multiple reasons) run a small open source ML project. I ignore virtually all support requests, but if you are a heavy open source contributor, you will get a response. You should mention that in emails; I'll go out of my way to help you (and often even promptly!)