I wouldn't invest in open-source companies, even though I ran one
The author makes a good case against open source businesses, but he indulges himself in a false dichotomy between a traditional proprietary model and open source.Increasingly often, there is no market for your proprietary software.  It is then not a choice between open source and proprietary models, but rather between doing open source or doing nothing.A lot of markets are just gone, and they're not coming back.  Odds are, you're never going to sell another proprietary UNIX clone, or a proprietary database, or a proprietary application server.  There are no punters.  Those niches have been extinguished.