[arien]

Just like mobile developers don't bother making Windows Apps because they consider the % of users is too low.

In other words, this manufacturer probably didn't care because the % of users who would use it for something other than the standard config is too small to justify the time spent outside that standard.

I don't think this specific case can be called monopoly. You can install Linux and other stuff fine in most laptops, this looks like an isolated case. I mean, you can even install Ubuntu on a Surface Pro and Surface Book (proprietary MS hardware).