I'd take that bet because they built a great product. It didn't work out and they want to move on to better things I'd happily be a part of that if I were an investor. They seem to have learnt the lesson that investors keep screaming and founders keep ignoring about trying to find the right market.
Probably through personal experience, Ive met Sumon a couple of times and would happily take bets on him being part of something successful.