Something similar to Unity, a draft version OGL 1.1 was leaked and had a lot of bullshit in it. companies that utilized the OGL to publish stuff related to dnd would have to pay a subscription of 25% if they made more than $750k per year, the right for wotc to utilize anything created on the OGL for any purpose, a ban on virtual recreations of dnd, and removing the ability to publish on the previous OGL version.
It ended with Hasbro completely backing down and Paizo starting the process to create a decentralized license called ORC that served the same purpose of OGL 1, with more control for creative companies
Don't forget Hasbro also sent the actual Pinkerton company after a MTG content creator
Edit: And keep in mind that everyone and their dog who based their livelihood on dnd diversified their portfolio. People are making new games, publishing different types of content, playing other games, etc. WOTC and Hasbro have killed people's trust in them.
Something like wanting to change the D&D licensing so that they can share in any profits made by 3rd parties, anyone making user content, adventures, etc.
The key part was they made it retroactive just like unity did. Essentially meant you needed to both pay wizards and also they could use any of your content without paying you. They wanted to kill Pathfinder.
They just want to make their own system. They are publishing board games and stuff too. Their new systems (theres 2 of them) were actually pretty deep in the works before WOTC shit the bed.