Waller
Legend
They're not just getting a cut, though. They're positioning to gatekeep the entire third party industry. As demonstrated by @FitzTheRuke just a moment ago. People won't buy stuff if it's not on DDB, and WotC decides what's on DDB. So far that appears to be Critical Role, Ghostfire, Hit Point Press, Kobold Press, Dungeon Dudes, and MCDM.WotC is getting its cut.
@Morrus are you in any secret negotiations which will result in your stuff on DDB in a year's time?