Tomatoes are a high acid food, The pH can for canned tomatoes can be between 3.5-4.7. Tomato juice midranges that, and ketchup introduces vinegar as well. Generally speaking, bioplastics aren't as hardy as other plastics, and adding a high acid product into a bioplastic container would encourage leeching. Since people both keep ketchup for extended periods and may leave it in the heat, it's probably not a good item to store in bioplastic.
There are other foods, like puddings and jells, that have higher pHs and shorter shelf lives, and they make better prospects. There are definitely food uses for the product.