Regardless of what price they quote in their emails, I’ve heard that Quid will only loan you a quarter of the FMV of your shares, at 15% APR (deferred) — plus 5.5% of your shares outright, which increases annually.
You should be able to get a non-recourse loan, i.e. where you never owe more than the stock is worth. That said, Reddit was one of the more secondary-unfriendly firms, if memory serves correctly, if you didn’t have Board or senior management connections.
It sounds like a horrible deal.