Another important step to consider is how to handle bad actors. If the site will be open to everyone then it gotta avoid making drivethru’s biggest flaws all over again. I thought I was the only one being abused there. Basically the same tactics used to cancel celebs were pulled on me. Which means there was a lack of will to fix the issue.
Reviewing would have to be totally overhauled.
Put some shitlords in charge of that.
No content gets taken down until after reviewed.
False flagging content gets you banned.
Only Illegal content gets removed? (I'm not for having Varg or ther JG guy on a site I own but I'm not the owner so)
As for categories:
OSR must have an actual meaning, I vote it should be reserved for games that are compatible with old D&D.
A different category for retroclones of other systems.
Maybe a broader one called Old School, then inside it OSR, OSG (this one with system divisions{d6, 2d6, 3d6, d%, etc})