The inverse of this is an old, old scam: 1) Send out a bunch of letters predicting moves on (usually) penny stocks; a different set of stocks is used for each

The inverse of this is an old, old scam: 1) Send out a bunch of letters predicting moves on (usually) penny stocks; a different set of stocks is used for each letter 2) A few days later, cull the recipients whose predictions didn't work out. Send another batch of predictions, again individually varied, to the remainder 3) Repeat once or twice more and you've got a small list of people who've received three or four correct predictions in a row. Hammer them with solicitations to invest in your "foolproof" scheme 4) Collect (via a pump-and-dump, or just solicit the money directly and run) Nowadays it's probably happening in Telegram groups or some such. Or you could do this on Reddit et al. using different usernames, and only keep the accounts that were right.