Commercial use of copyleft works

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The commercialization of copylefted works differs fundamentally if a free and open copyleft license is used or if the copyleft license is de facto a commercial one, restricting certain use cases. The economics for free and open copyleft works tends to be on the commercialization of other scarcities, and complimentary goods rather than the free works themselves. One way to make money with copylefted works is to sell consultancy and support to the users of the work.^[1]