I think the market is not in parsing, but extracting nutrition information.
The project kind of came out of me needing ingredient parsing for a different product and existing solutions being a poor match.
Edamam requires you to display their logo in your app if you use their API, which I found inappropriately intrusive.
There's a similar service called Spoonacular, but they don't allow you to store results for more than an hour, which is crazy. I wanted to build a search index that let users search by ingredient, so it made no sense for me to reprocess my entire corpus of data every hourly.
But they succeeded and I didn't, so maybe the weird API terms are what they need to survive.