I think people might be equivocating over the word “ad.” Some people consider ads to be interstitial modals which steal focus and have nothing to do with current context. I am much more sensitive and consider any notification to buy or use a service to be an ad. Maybe not pre-installed games but I would prefer they not be there. Microsoft is about as bad as Apple is at suggesting we use their cloud services. I also consider these ads. Still, if I’m honest, they’re infrequent and hardly insurmountable. If one is sensitive to this, the Pro version of Windows makes it easy to disable almost all of this stuff.