Man there's plenty of amazing examples of caste systems on the internet, but Discord Nitro ain't it. Discord is a free app without ads. Nitro is a reasonable monetization strategy for a chat app that works incredibly well and fosters probably millions of communities.
A different monetization model is easily conceivable that gives paid users better functionality instead of (what the author calls) "aesthetic perks" that only serve to evoke class envy, as if like jewelry.
I don't have a strong position on the author's point. Just making sure the right thing is being discussed.