Therefore, the possible answers will simply be the guesses of a particular clerk, and will range from "use everything you want and however you want" to "using the map editor is a sin." And is it worth trusting such answers in the end?
But not everything is so sad. I think Ubisoft simply doesn't care about most of these things. Plus, they don't care about Heroes of Might and Magic right now. That is, I can hardly imagine a scenario where a giant like Ubisoft would spend time and resources to sue a particular mod creator, or even the entire tiny Heroes community. They are, of course, an empire of evil, and so on, but even they are not that crazy.
Well, purely in theory, if someone needed it, they could easily find something to use as a pretext, even if there is no real violation of the law. But seriously, come on. No one needs this. Otherwise, for example, they would have shut down all sorts of GWD and the like a long time ago, which, by the way, make money from their activities.