Buy PCs without Windows, even if you want to use Windows. Install it yourself -- clean installation. Even then deabloating is needed nowadays.
Bloatware, adware and crapware should not exist.
I remember someone recently telling me about laptops that have Linux exclusively bought on them, and how that you're still able to put Windows on there albeit it doesn't have an activation key and whatnot. Too bad my current PC came with Windows...
Bloatware, adware and crapware should not exist.