I'm also of the mind that it probably wouldn't hold up in court if challenged, they're probably spending most of there energy determining how to thread the needle to make the cost of a legal challenge seem counterproductive.
The crossover of people who play other systems or OGL games, and D&D is probably pretty large, they're maybe not considering how much they might be cannibalizing their own business. All in a hopes of pushing people online, I thought we were past the streaming wars.
I remember there was a shake up at Hasbro a few months back, which resulted in them axing a number of multimedia initiatives, those games you guys were talking about, and movies. I guess they're looking to make up the lost potential diversification through One D&D.