They control the canon. There are lots of DMs that at least didnt allow 3rd party products. There will be slight variations in the new updates that make tooling based on 5.1 seem slightly off, and this will help guiding preople into the only platform providing the full official sanctioned oneD&D experience.I'm not sure where you are getting that. It seems counterintuitive given their stated goals of controlling what is D&D in public perception, as well as controlling the VTT space. Putting the 5E SRD up on CC basically destroyed their ability to control anything about 5E.
This was the approach I was assuming they were going for long before the OGL1.1 leak. It hence came as a shock to me, as it appeared so utterly unneccessary for what I believed was a winning gameplan.