I can give you a dozen reasons why Krewe IS ambitious. And the competitive space is a joke. Every other company is trying to do a "Tinder for friends," but that model is inherently broken. Krewe is doing something entirely different as it actually replicates the way people naturally make friends (particularly when they're young).

Response to edit: Krewe is not a social network in the same sense as something like Facebook. It's aims to get you to actually meet (in the real world) and get to know people who live near you. It does so in an a way that's both comfortable and convenient, which gives you the best chance of forming real friendships. Everything else fails at either comfort or convenience (or both), which is why no one has been able to make a dent in the (massive) market.

Krewe is bottom up vs Nextdoor which is top down. Krewe places you in a group of five other people and then lets you expand from there. Nextdoor dumps you into a chat room with all your neighbors -- it doesn't exactly encourage you to meet people. It's really more like Craigslist. My neighborhood (which has 60,000 people in it) has no activity in it.

I can go on on how Krewe's different, but rest assured, it is very different from anything that's out there. I have exhaustively looked.