You don't take the data at face value. The goal of these systems is to reduce human intervention, not to remove the intervention. If a firm fakes data, you still have proof in the bad products and customer complaints. This lets you investigate and file complaints on the public blockchain. Think of it like a review of a company's supply chain reliability.
More advanced systems consider using third party, tamper proof scanning systems and packaging. Again, the costs of these systems are quite high, especially for food, but there are physical ways to reduce fraud if the data holds enough value.
More advanced systems consider using third party, tamper proof scanning systems and packaging. Again, the costs of these systems are quite high, especially for food, but there are physical ways to reduce fraud if the data holds enough value.