Wulf Ratbane
Adventurer
The OGL is and was a cynical attempt to get people to curtail their rights to copy game rules wily-nilly.
Not entirely. The OGL did enable you to copy the exact text of the PHB, which would otherwise have been protected by copyright.
Exactly this.
"Safe harbor" isn't insignificant, either. There are lots of very small press publishers and hobby designers (myself included) who never would have bothered without the safe harbor.
And some bigger names, too. The game mechanics were significantly advanced because so many people outside of WoTC were getting into the guts of the system. Mike Mearls, Monte Cook, SKR, Chris Pramas... I don't think any of these guys had any interest in "fighting the good fight" over legal issues of game rules copyrights when what they really wanted to do was just write game rules.