KSP2 is such a sad situation all around. The guys working on it had the same idea and were going to build a brand new engine for it to fix the tech debt of the original, but management demanded that they use the original engine “to speed up development time.”
Like with pirating, it was always an issue of expense. They could legally take away your disk at any time and force you to uninstall the software from your computer. It just would never be worth it to go after any specific individuals for any minor infraction of the license. Digital licensing just made them capable of doing that with the press of a button.