Pass through revenue isn't a great metric to value off of. It's a fancy and deceptive way to pass off a broker like a software company. If you pass through 70%-80% of your revenue, your revenue is more accurately stated as a net revenue. It's more akin to how we value traditional retailers in brick and mortar businesses, with low margin - think Best Buy.

I’m referring to their last valuation of $400m in 2017. The company hasn’t hockeysticked since then, by any measure (e.g. App Store rank), so I think we can deduce the sale price was likely well below $1b, maybe 500m at very best but guessing lower. Factoring liquidation preferences for VCs and you get a small pie for most people involved.