That sounds neat. I have the three core Grim Hollow books and they get constant use in various ways in my campaign from the monsters to the advance weapons and spells PCs and NPCs use, to the transformations. Glad they can use WotC’s platforms to talk more about their work.
Interested in ramping up your encounters in 5e? Sly Flourish has a new book on Kickstarter to help GMs with their monsters, The Lazy DM's Forge of Foes. Through EN World’s darjr, I was able to connect with authors Mike Shea along with Teos Abadía, and Scott Fitzgerald Gray agreed to share some...
My opinion is WotC is in the right path using D&D-Beyond to promote 3PPs. Really they shouldn't be fighting for a bigger piece of the cake, but it is better "making more cake". The 3PPs help to promote the hobby and these can fill "empty spaces" WotC can't.