I think somewhere in 200X all PCs sold in China are mandated to have some government-made "firewall" software installed that is known to send your "print screen" to central server every 30 minutes.
So... It's only sane to remember to wipe the new brand computer once you tested it's hardware is functioning properly and make sure you've found all the drivers you needed. (some vendors don't provide separate driver downloads)
Btw, I think it'd be much better if Microsoft can provide "vanilla version of install image for individual OEMs" to download so customers can have fresh starting base without need to buy another copy of Windows.