My understanding of that Soros trade is that it was not an actual short (the product was not public), but it was a synthetic product that was correlated on the Lyft ticker, that probably behaved like a Short but wasn't a short.
They might have edged their position by issuing an actual short, I'm only saying they don't necessarily have to.
From what I understand they make their money off of a deal like this by either taking a cut or fees.