Wouldn't this also open up to foreign influence dumping money and misinformation to promote negative policy decisions.

Or not even foreign influence. It's just rephrasing money = speech. Instead of spending millions to influence voters, you spend millions on positions, and you get your money back if you don't win your side? So it lets the megacorps/trade groups get richer by removing the uncertainty of lobbying in place of buying policy once you hit a certain critical threshold of money to throw around.