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During most of the time since Windows exists, the majority of its users have not paid for Windows separately, but as a part of the purchase price of a new computer.

Android could also be paid as a part of the purchase price of a smartphone and maybe it already is, but of course a one-time payment would be much less profitable for Google than a continuous stream of revenue from the apps.

majority of the world never paid a single cent for windows

It was built into the cost of the computer.

And cost of Android isn't or can't be?

They make most of their money from user data and search anyway.

Same for Android. Google charges a licensing fee from manufacturers.

I think you meant ads instead of apps.