https://en.wikipedia.org/wiki/Psystar_Corporation
Obviously if a company isn't selling product with OSX installed it's different, but any marketing that suggests it would likely be problematic. Besides, the community has done a pretty good job of identifying compatible hardware
1) Was kind of a scam
2) Sold computers with OS X already installed
2 is the real violation that got them sued. Obviously it's legal to sell computers that are compatible with OS X. Selling them with OS X installed in violation of Apple's EULA is a good way to end up in court.
> Obviously if a company isn't selling product with OSX installed it's different
> Obviously it's legal to sell computers that are compatible with OS X
Never said it wasn't. Only that most companies wouldn't market their product's alternative illegal uses, as that puts them in a gray area. (Almost every product can be used for illegal purposes after all)