a86[1] was definitely one that did. It was sold under a shareware model, and if you used it commercially you were supposed to buy the licence. I guess they ran

a86[1] was definitely one that did. It was sold under a shareware model, and if you used it commercially you were supposed to buy the licence. I guess they randomly sampled other people's software to see if it looked like it was built with a86 or not, but honestly I'd never actually heard of them doing that and suspected that it was just enough of a threat to know it was possible that they hoped people would pay up. [1] https://en.wikipedia.org/wiki/A86_(software) https://en.wikipedia.org/wiki/A86_(software)