That's a bad analogy. A door lock protects the user. A door lock can be left unlocked. DRM does nothing to improve the user experience and it frequently punishes paying customers. Even the best, least hated DRM will negatively affect legitimate users by its very nature. And Denuvo is one of the worst.

If you want to use the door analogy, it's like every time you want to open the door you need to call the door company and give them the serial number that's on the door to show that you bought an authentic door. And any one else trying to open your door can also give the number written on the door because the company only cares that it was a legally purchased door and not about protecting the user.