>Unlike the Windows and Steam store, we don’t ask for money for Krita in the store, since it’s the only way people can install Krita on those devices, but you can buy a supporter badge from within Krita to support development.
I don't know about the Windows store because I don't use Windows, but doesn't the Steam store allow you to put up free tools? Godot Engine is available for free on Steam, IIRC.