> 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.

More generally people seem to get tunnel vision about open source models. The big distinction in business software is not open vs. proprietary but SaaS vs. non-SaaS, with SaaS increasingly dominant. OSS companies therefore need to have a SaaS strategy. You build your own on community OSS projects, supply other SaaS businesses, or use OSS as an on-ramp to your SaaS product.