Why are D&D fans upset?

There are a few reasons that fans of all stripes banded together to protest the new OGL. First, the groundwork for resistance was already built up. The explicitly contentious #OpenDnD movement had been on people’s minds and in the conversation for a month or so. And other corporate missteps like the MTG Anniversary release (where unplayable cards sold for nearly $1,000), offensive racist depictions of the Hadozee, and Hasbro executives publicly calling Dungeons & Dragons “under-monetized” had all led to increasing resentment and frustration among many players. The OGL 1.1 represented many worst fears confirmed, and the leaked document appeared to be a critical failure to listen to the fandom.