> They have a windows 10 builder tool that downloads the ISO and burns it to USB or DVD. So there's not much stopping a customer from registering and then doing a crapware-free clean install. The downside (besides needing the skill and time to do it) is you'll lose any baked in freeware but the line between freeware, trialware and crapware is so thin now I'm not sure that's a concern.
And the best thing about your computer is that it's so complicated that a determined manufacturer like Lenovo can hide their crapware installers in, say, the UEFI. Which will then automatically install them on a fresh OS install.
You make the mistake of thinking that you own your computer. You do not.