AST SpaceMobile has a great plan, but investors don't seem to be confident that it can actually bring that plan to fruition. Shares of AST SpaceMobile (ASTS -4.24%) are down over 80% from their peak. Over the past year, the stock has lost around 50% of its value. This is a high-risk investment, but with a sub-$3 share price, some investors might be interested in bottom-fishing. Is it worth it? What does AST SpaceMobile do? At this point in time, AST SpaceMobile doesn't really do anything from a business per ...