I’m not sure oem adoption would make many people migrate. Here in Brazil, it’s a common practice for oems to sell computers with linux, and they cost cheaper, with the same hardware configuration. The result: people see them just as a cheaper option and ask their Tech Friend™ to install a pirated windows for them.

I don’t think that people don’t make tech choices. They actually choose windows, and will find a way to have windows, if it’s not a default. People who use linux do so mostly as a choice, not simply because it came installed.