I think the catch is more on extensions and accessories for D&D. There is obvious stuff like pre-packaged one-shot adventure books or custom character classes.

I think the catch is more on extensions and accessories for D&D. There is obvious stuff like pre-packaged one-shot adventure books or custom character classes. Less obvious stuff like DM screens, stat-trackers, or spell cards. Then there's the "corporate dystopia nightmare" like wizard of the coast demanding a cut on sales of dice towers, notebooks, d20s, etc.