Yeah, it’s a line that is tough to draw. And as was pointed out above I think the verynfact they are selling these dances as their own discrete thing, as if the dance animation was the value itself, that changes things. Had they been included in game, but not sold as separate items? Probably less of an issue.
But when they take the creative work of another, package it and sell it as it’s own thing, and no attribution? That definitely crosses the line. And that is undeniable to most.
Where, specifically, that line is? A different question. Would mere attribution but still making all the profit be over the line? I’d say yes, Stusser says no. Would some small license fee and selling it but without in game attribution be over the line? Eh probably not. Having them be something in game, but is not sold distinctly, but no attribution? Sketchy, but probably ‘ok’.
Like any one aspect of this
-selling the dance as a distinct item
-no financial compensation
Is not over the line, inherently. And you can probably combine two of the three and be, if not ok, at least firmly in the grey where reasonable disagreement occurs. It’s when you put all three together that it’s definitely not all right.