Why would any paying customer use ReactOS over windows? There is no support (security patches automatically supplied ETC). Windows 10 is evergreen and new feature appear quite often. Microsoft loses exactly zero dollars a year because of ReactOS. People who don't want to pay for windows just pirate it. Those who do pay, get it buldled with a computer or laptop that they purchase, or are corporations who need support. ReactOS will always be a tinkerers hobby... Did they steal code? Did they reverse engineer so good that it looks like they stole code? Who cares really... Not Microsoft. Why would they?