Citation needed that software industries are dominated by proprietary offerings? It's very hard to measure when there are so few public open source companies.

How many open source companies are there? By open source company I mean companies whose each software product is open source. How many are public companies? Maybe, even just compare those to companies who's products are "open core", which seems to include most (all?) of the open source SaaS offerings.

Or look just at the largest public software companies and estimate their commoditization through open source and community participation through open source.