If you're not aware, many of the core contributors are employed by these companies, or extensions are built internally at these companies and then released open

If you're not aware, many of the core contributors are employed by these companies, or extensions are built internally at these companies and then released opens source. For example, the long time maintainer Junio works at Google and peff at GitHub. I think the current management of the project, by the Project Leadership Committee, is working well and the project would gain little by coming under the direct management of any single company.