Pretty much all OEMs preinstall adware. Microsoft infects their own OS with crapware.
They don't all ship with malware infested UEFI so that even reinstalling your OS won't remove the bloatware they installed. Also Lenovo has, multiple times now, installed adware on systems that seriously compromised the security of the user and/or the device.
Adware is bad, remote code execution is much worse.