The article tried to paint the monks in a favorable light for limiting their production for environmental reasons but the phrasing rings hollow to me. They didn’t stop all production, or release the recipe to the world. They merely limited their output which, much like many companies with monopoly power are currently finding, allows them to have a higher price per unit, while no one can come in and compete in their market.
Do you work every hour you possibly could? Would it be reasonable for someone to complain that you owe them more work because they would really like it if you worked more?
Their attitude is akin to how people complain and demand stuff from open source projects and why authors are annoyed when supporting such projects.
It reminds me of "The Menu" movie, the producers got fed up with the consumers and they took drastic actions. Wasn't a big fan of the movie but I can see how creators would go to such extremes or at least fantasize about them.