I'm still confused how "deauthorize 1.0a" figures into this leak about D&D Beyond.
Steampunkette has the right of it, but I think there's even more to it. (Edit to add: They don't need to revoke 1.0a in order to do what Steampunkette suggests, because they will control the terms for content on their
own VTT regardless of what the OGL says.)
I've been arguing since early last week that deauthorizing 1.0a is all about making sure "One D&D" really is
one D&D.
A lot of groups are going to want to stick with 5e rather than adopt the 1D&D ruleset.
Despite the purported backwards compatibility, that creates a jumping-off point of sorts for new WotC products that WotC wants to discourage people from taking. Shutting down creators' incentive to sell new 3rd-party content for 5e is a key part of their strategy for blocking this off-ramp.
I'm also convinced that once the current "custom agreements" between WotC and existing VTTs expire, they will not be renewed (assuming WotC's VTT is active at that point). At that point those platforms could continue to provide SRD-based 5e automation, allowing groups to continue with their preferred edition of the game on those platforms rather than switch to WotC's VTT.
WotC has likely concluded that they
must stop this by destroying 1.0a, thus meaning that while you
can still play 5e on those platforms, the platforms won't be able to provide you with preloaded spells, monsters, classes, etc. This is why I predict they will never back down on deauthorizing 1.0a: they believe 1.0a is an existential threat to the transformed business model they envision for the brand.