Issuing a license is a form of "using it" in a use it or lose it scenario.

Those are not patent troll companies. Patent troll companies file patents and then sit on the patent until they can sue another party for infringement, and never make an attempt to commercialize their patent.

Another example of not using it in the use it or lose it scenario is Pfizer's acquisition of Esperion Therapeutics in 2004. Esperion was developing a competitor to Lipitor, so Pfizer purchased Esperion for $1.3BB and shelved the technology to prevent competition with their best selling drug. Had Pfizer "lost" their patent for failing to commercial Esperion's drug, that drug could have entered the market as a generic to compete with Lipitor and severely reduced the cost of statin drugs for consumers.