Knowing a few people running lubuntu doesn’t make it an average. That is just a personal bias.
From experience almost all the computers I serviced over the last few years were either bought at Walmart, Best buy or Amazon that could also be a bias, but it spans over multiple cities with a good hundred clients The only time I started to see computers that were consistently bought from the manufacturer is in a business environment. But the specific one I’m in doesn’t support Linux at all within production.