The only reason there is one Linux kernel everyone uses is because of the license. If it wasn't GPL2 there would be "Microsoft Linux", "Google Linux", "Oracle L

The only reason there is one Linux kernel everyone uses is because of the license. If it wasn't GPL2 there would be "Microsoft Linux", "Google Linux", "Oracle Linux" all with different features and potential incompatibilities. At least with the GPL2 license those flavors have to contribute changes back upstream so everyone gets the benefits.