I was not in a aware state of mind when writing this reply, obviously if Asana was pulling in $1b+ a year in revenue they'd be valued at an order of magnitude more than $1.5b.

Their revenue would probably still be pretty good since they have 50k+ organizations paying $20+ per user per month [0].

[0] https://blog.asana.com/2018/09/asana-company-updates-2018/