FallenRX
Adventurer
Justin Alexander made a video of his history of the Open Game license, put a lot into context, espeically the 3.5e/4e era perspective shift.
Its a good watch
Here is it in written version. (This version was made before current events, but obviously, the situation has changed, but still a good write upl).

Open Gaming License: A Brief History
What the heck is an Open Gaming License?And why should you care?The Open Gaming License, or OGL, is what lets people sell D&D-compatible adventures and supplements without getting Hasbro