These apps also lack stuff besides common American/European dishes. Most of my food is healthy homemade food and entering them is an absolute pain.
Eating homemade stir fried celtuce [1]? Homemade steamed marble goby [2]? Nope, out of luck. They only have nutrition info for packaged mac and cheese.
Interesting and valid issue! I assume it's crowdsourced data from a community and just isn't that popular where you are, but good points.