It doesn't matter that it's not a binary choice to pick a stock, you can convert it into a binary choice at will. For example, you can send out 1M emails with stock recommendation for some large stock with "buy" or "sell" as a 50/50 coin flip. You didn't pick the stock, you chose between buy/sell, the outcome will be the same: your market prediction skill will look fantastic to a select few.
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It doesn't matter that it's not a binary choice to pick a stock, you can convert it into a binary choice at will. For example, you can send out 1M emails with stock recommendation for some large stock with "buy" or "sell" as a 50/50 coin flip. You didn't pick the stock, you chose between buy/sell, the outcome will be the same: your market prediction skill will look fantastic to a select few.