(1) They say that 78% of the companies surveyed use OSS internally.  I&#x27;ll bet it&#x27;s more like 78% realize or admit it.  It would probably be very hard to run a business nowadays without using at least some OSS somewhere.<p>(2) The author&#x27;s recommended approach of combining some OSS with proprietary enhancements (commonly called &quot;open core&quot;) is certainly not the only way to make money from OSS, and I don&#x27;t think there&#x27;s even much evidence that it&#x27;s a particularly effective approach.  <i>Some</i> customers are &quot;more than happy&quot; to pay for an &quot;enterprise grade&quot; version.  Others aren&#x27;t, and that number goes up as the price for the proprietary version increases.  They&#x27;ll go it alone, hire consultants, or switch to competitors.<p>A recurring-revenue &quot;subscription&quot; model works surprisingly well.  (This is where I should add a disclaimer that I work at Red Hat.)  Customers will pay a modest amount, year after year, to get easy&#x2F;timely updates, priority bug fixes, training, certification, indemnification, access to developers, and so on.  People will be &quot;more than happy&quot; to pay for a safety net that they never actually use, and it&#x27;s easier to keep TCO lower than competitors with this model than with the open core &quot;freemium&quot; model.  Less immediate revenue per customer, but more customers and more loyalty.  I guess &quot;don&#x27;t be greedy&quot; is the lesson here.  ;)