There should be P.E Firms run by OSS devs concentrating in being the succession and exit plan for OSS founders while charging big tech cos ($1bn+) for support.

Might sound a bit evil at first but it is the way to bolster the whole xkcd issue.

Or we could shame companies into action by refusing to use and pay to companies who use FOSS (all of them) but don't contribute back (most of them). Lastly, don't contribute to their FOSS projects, regardless of how nice they might look, if they're not contributing to the ecosystem overall.