“The better question is why does YWN allow such obvious trolls?”
Because the editors are hoping that Elon Musk will make an unsolicited offer to purchase YWN given that he is likely to walk away from the Twitter deal. The valuation of a social media site is based in large part on the number of postings and active users they can sell to advertisers. Trolls are good for what the investment bankers call “engagement” (aka how long users stays on the site). More trolls means more engagement means the stock options held by the Mods will will be worth a fortune.