> The platform fee for notorious quasi-monopolist Microsoft Windows is still zero.

While true, paid-for apps from the MS store - the option that should be recommended to laypeople, instead of the dodgy websites that have download button styled ads - charge a registration fee [0] and Microsoft takes a cut of 5 - 30% [1]

[0] https://learn.microsoft.com/en-us/windows/uwp/publish/accoun... [1] "Microsoft takes 5–15% of the sale price for apps and 30% on Xbox games"; https://en.wikipedia.org/wiki/Microsoft_Store