I worked for a shady evil company, and when they illegally fired me, I never ended up returning a laptop - thinkpad running windoze.
Let’s say I wanted to put Win 8 or similar on it so I can play some video games. What would potentially be barriers to doing this? Said evil company is hopefully going out of business soon, and is a clusterfuck anyway, so they might not end up asking for it back.
And your words show your lack of experience in the matter. Usually work laptops have their bios locked down, so you can’t access it and change the boot sequence and install what you want.
Some just put a password that sometimes can be reset, other times there are full on lockdowns by dedicated security apps that are very difficult (if not impossible) to circumvent.
You’re right (and upvoted accordingly), but if said evil company is as much of a clusterfuck as OP said, I wouldn’t bet on them having competent security measures in place.