> And Melvin Capital lost a couple billion dollars while quite a number of Redditors got a massive payout, so a net win for society.
And quite a lot of Redditors suffered massive losses. There's not shortage of WSB posts with 7 figure losses. Overall it's pretty hard to assess whether on net "Wall Street" made or lost money to retail. Melvin certainly wasn't the only player here.
It's likely that other funds jumped in on the squeeze, and were much better in terms of timing their exit. Some funds may have shorted on the way back down, and made a killing.
But most importantly, intermediaries like HFTs, option market makers, internalizers, and stat arb funds made a killing. Almost entirely at the expense of retail flow. It's like a casino. Some win, some lose, but the house rake always wins.
But even if retail on net made money, it probably wasn't a benefit to society. 20 people losing their life savings so that /u/deepfuckingvalue can become a multimillionaire isn't exactly a heartwarming story.