I thought companies were smart enough not to do this (or at least not to admit to it, damn)
https://www.techpowerup.com/226069/microsoft-entering-agreements-with-laptop-makers-to-block-linux
Digital freedom activists are up in arms over a discovery by Lenovo Yoga 900S and Yoga 710S users that you simply can't replace the pre-installed Windows 10 Signature Edition operating system with one of your choice, such as Linux. Redditor BaronHK tried installing Linux on their notebooks and couldn't, so a support ticket was raised with Lenovo to guide them to install Linux. Lenovo responded that the notebook features Windows 10 Signature Edition, and that "it has been locked as per Lenovo's agreement with Microsoft."
https://www.techpowerup.com/226069/microsoft-entering-agreements-with-laptop-makers-to-block-linux