My point is that many of the contributors to Lucene are motivated by the benefit it provides to their own companies and are paid to make those contributions as

My point is that many of the contributors to Lucene are motivated by the benefit it provides to their own companies and are paid to make those contributions as part of their job. Their contributions also benefit anyone else who chooses to use Lucene including large corporate entities such as Apple, LinkedIn, Twitter, and Akamai even those companies contribute little or nothing to Lucene. In other words, on the spectrum of people who are "monetizing" Lucene, Elastic and LucidWorks contribute far more than others and are called out about it only because their products are externally distributed and visibly leverage Lucene.