ccs
41st lv DM
I have two worlds. I've been running them since 2008 and 2013. Those worlds exists long before the players sit down at the table. If someone isn't interested in that type of world, he/she's welcome to start his/her own game. In fact, I highly recommend it.
No Evil PCs - Nope
No {insert race/class/etc} - As long as it exists the world, it's not my business. One of my worlds is human only. 100% of the NPCs are human beings. Even then, if a player wanted to play a dwarf, I'd say, "go for it." He'll just be the only dwarf who's ever existed. "The name's Half Man, first of his kind." Likewise, Christianity is the only religion of that setting, but it didn't stop one of my players from playing a cleric of Zeus.
Build a character who fits this {insert theme/region/etc} - Once again, not my business.
What about when your not the DM?