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I see what you mean. Yes there are great examples like those that offer support contracts for the open source software projects.

I think one point of confusion here is that as open source licenced projects, they do not restrict commercial use. The companies that lead the development just happen to also offer the best paid support.

Minor correction: proxmox is AGPL so free to use commercially without their support contract.

Ubuntu and LibreOffice are both free for commercial use. Or am I misunderstanding what you mean?

It's no longer open source if you restrict commercial usage. Sure, licence your software that way if you want to, but don't call it open source.

Very informative!

This is one of the greatest recordings of all time. Each musician is absolutely killing it.