The "top line" number can mean a lot of things though; it almost certainly includes the assumption of hitting several targets, some of which are reasonable and some are probably stretches. It's also a very real possibility that the "real" cost that Chase paid was just the right amount to make the common stock evaporate; investors get their money back such that $0 is split amongst common stock. Employees then are given a sheet to sign saying that their stock in WePay is now worth $0, but here's an offer for Chase stock vesting over 4 years.

Anecdata, for sure, but most of the deals I've seen have been something like this. The top-line number is all well & good, but the real dollars people extract from it are invariably less (again, just in the limited set of things I've seen). I'm sure there are exceptions (I bet the Instagram folks did just fine). But if I had to make a guess, it'd be that the founders will come out with a good chunk of cash, and employees will get a job at Chase out of it (with the valued employees getting a nice bonus at the "new car money" level)