D&D is a culture and a movement and a worldview, far more than it is a product
I think this is a contentious claim. As far as I can tell, D&D is predominantly a series of products that people purchase from WotC.
There are endless threads on this site alone about the Amazon sales rankings of D&D and PF books. If D&D was not predominantly a product, those threads would make no sense.
As far as D&D being a "movement", the only "movement" I've experienced in relation to D&D was waves of unrelenting hostility the last time I was predominantly a D&D gamer, ie the period around 2009-16.
D&D is not a story. it isn't even a setting. it is a framework. It does not conform the IP licensing the same way Star Wars or Halo does. You can protect The Forgotten Realms the way you can protect the MCU, but not "D&D".
I'm not sure what the "framework" is for D&D. You mean rolling a d20 for some bits of action resolution and results determination (mostly attacks and saves), and rolling various other dice for damage? My favourite implementation of those methods - 4e D&D - is regarded with something between negativity and scorn by most people who (to me) seem to think of themselves as guardians of the essence of D&D.
In any event, to me - particularly in the ways I've engaged with it over the past 6 or so years - D&D is predominantly a collection of settings and setting elements, and a certain idea about how adventure occurs in those settings and setting elements. I've used those setting elements - mostly the geography and history of the world of Greyhawk, but other ones too - in multiple games using multiple rule sets. (Torchbearer, Burning Wheel, Cortex+ Heroic and AD&D being the main ones in that time period.)
the OGL was not designed to protect WotC's good name or even shelter D&D. it was designed to protect D&D from being destroyed by corporate greed. It's goal was to make sure that should poor management or actual malfeasance lead to the death of D&D as a brand, the GAME itself would live on.
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The core idea of the OGL was pretty simple: , and the OGL was there to make sure than no one could kill it by making bad business decisions because there would always be someone able to take the essense of D&D (the SRD) and rebuild it.
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You want to know what a "free" D&D looks like: it looks like the OSR. I am not an OSR devotee. i own maybe 3 OSR games. But they way that community has made D&D of a certain era their own, and shared ideas and created a community is EXACTLY what modern D&D needs.
Putting to one side that the OSR is not based around the SRD as the essence of D&D, but rather around a series of earlier rulesets published in the 70s and early 80s, if the point of the OGL is what you say it is then that point has been realised, and whatever WotC does in the future won't change or undo it.