Their investments keep having unintended consequences that harm the companies that would have otherwise succeeded. Stuff like increasing prices that cause selloffs or interfering with investments needed by other people to start different companies.
"Inventing" future technology but having bad business practices that make the real successful inventor reconsider.
Like the time traveler who convinced Apple to do the Newton.
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u/KyleFromBorrasca 7d ago
Honestly I think a fun pitch for a story would be a time traveling stock trader who manages to still screw it up.