I heard that's because MealSnap is a ripoff of another app that uses AI and applied to YC for this session, but didn't get in because a cofounder bailed. I wish I could remember the app's name - the main dude is still going and a super sharp German math whiz.
The app is called Photato, it's not out yet but we have a new team and are building something that is accurate enough to be of use to the Quantified self community. If anyone here is interested in testing Photato, drop me a line at taro.franke (at) gmail (dot) com