> The immediate follow up question is can corporate support of open source projects count as product dumping?

For what it's worth, I'd classify true open source as the only exception to anti-dumping laws. If you want to burn money to fuck over everyone else, give up your competitive advantage.

> The immediate follow up question is can corporate support of open source projects count as product dumping?

It can when the competitors are dead, and the patron yanks all funding and support from the project.

I can't imagine trying to prove that in court though.