It's a free game, not a government service. You don't actually have to be "fair" (whatever that means).
Anyone saying a DNC would be good enough for a stalker has never had a stalker. It's a game, staff doesn't actually have any obligation to a stranger who just logged on, they can just trust their known player and go on with their life. If you don't, the person being stalked will leave, so you're choosing to have the stalker on your game over the player who was already there being unproblematic. Have fun with that, I guess!
Shoutout to Arx staff for handling my stalker the minute I said "hey I have a stalker."