Jet is on pace to do $1B in sales this year (not profit, but gross merchandise value). Not bad for a company only selling stuff for 16 months.
They aren't a direct competitor to Amazon in model, they are closer to a seamless version of Flipkart in india.
My friend who works there says they see Target as their competition more so than Amazon, and that could be what Walmart sees too.
I do wish we could have seen where this company could go, but likelihood is it became increasingly difficult to attract VC money in this market that is tightening.