These businesses all seem like something that very well could make you money, but would never scale into a growth startup.
And it seems the time it takes to build one of these or a growth startup isn't going to be too different.
I might even say that you similar chances of making a similar amount of money from either.
Ingredient line parsing is a really small market and something that sounds like a fun project to work on but is probably not a business venture that has room to grow. The number of companies that have enough recipes to justify automation, profits to justify paying for it and nobody inhouse who can implement it is really small. There's no viable price point for a product like this when you factor in the cost of customer acquisition.
Content based consumer sites are also really hard to get off the ground and it's not something that I'd recommend any bootstrapper to try unless you can charge for it.
I'm sure it's all a great learning experience though and if Michael keeps iterating the way he is now he'll definitely end up finding a worthwhile business venture.
So why not shoot for the larger moon?