The fintech giant has fallen on some hard times. Block (XYZ 1.31%) stock, when it was formerly Square, was a market darling that soared quickly and was seen as the face of the fintech revolution. But it's made a few missteps, earning severe market pessimism. Although it has grown quite nicely over the past few years, Block stock is 77% off its all-time high. Let's see what's happening at Block and whether or not it can be a millionaire-maker stock. Although much attention has been given to Square's other bu ...