I don't know how many might remember, but back in the day TSR lawyers would go after anyone who put up fan made material in the bulletin board/early net days. It really stifled a lot of creativity. So anyone being able to post their content without having lawyers sicced on you is a good thing.
But the thing is, back then we mocked stupid stuff. The difference now is if you mock stupid stuff to you, you're judged and executed by the sjw's. Almost as worse are those who say, eh what's the big deal? Even more worrisome is here is WotC, the makers of one of the most popular iterations of the game, putting wheelchairs in everything. It's like WotC knows that they will be attacked or they are already infiltrated by the sjw's.
So yeah, I can tell any player that you can't play a wheelchair bound player, you can't play a centaur, you can't play an kenku, etc in my game. The difference I see now is the entitlement a seeming (notice I said seeming) majority of players have. Every time I post a type of game I want to gm I get no responses or a how come you're limiting stuff questions.
It's the main reason I run DCC now. Because the implied setting and with the core rulebook classes only sets the tone of my games.