Remember kids if you’re going to buy a Chinese pre-built, wipe that shit before use.
Always wipe and start fresh. Yes, Chinese brands seem to be worse about security, but there's no reason to keep bloatware and FSM only know what other crapware the OEM installed.
Yup, I don't trust it to not install a rootkit on the BIOS or something. Buy from reputable companies, and if you get a prebuilt PC, you'll probably want to reinstall Windows to get all of the adware off. If you don't use Windows, you're probably fine with just buying from a reputable vendor.