Haha that's how I started my business 15 years ago. I was still in school and I got a few old ThinkPads with broken displays so I installed debian on them, put them in my shelf and sold webhosting.

Good times. I did a writeup 5 years ago how it looked like: https://blog.haschek.at/2015-my-company-just-turned-10.html (down at "Our Hardware")