I believe Win10 license price scales roughly with processor power, so it might be fine.
Which gets to the complicated part of the question in that this is the licensing for OEMs. Running Windows 10 on an RPi as a "consumer" that isn't an OEM (and isn't building/reselling devices) is an interesting question.
Though as a consumer, Windows 10 is also weirdly "shareware" these days in that it's not entirely that mean in what features it disables (versus say XP almost not working at all) when not activated and will happily explain in the Microsoft Store how much it costs to activate and let you buy it there. (Example: https://www.windowscentral.com/you-do-not-need-activate-wind...)