I went on the same search. For those interest in formal definition: Commercial open source software projects are open source software projects that are owned by

I went on the same search. For those interest in formal definition: Commercial open source software projects are open source software projects that are owned by a single firm that derives a direct and significant revenue stream from the software (reference: https://link.springer.com/chapter/10.1007/978-3-642-03132-8_2 https://link.springer.com/chapter/10.1007/978-3-642-03132-8_...).