looking at last 1000 commits to gcc, it seems like about 80-90% of emails are associated with "big corps". however, this doesn't tell the whole story. according to https://lwn.net/Articles/867540/, over 85% (100%-6.8%-5.0%-1.6%=86.6%) of Linux kernel changesets are supported by employers, but nobody sensible would claim that Linux is not community developed. whether it is because of historical project culture, or BDFL, or simply a large number of contributing organizations, there is clearly a substantial difference between Linux and OpenJDK development methodology.