I am trying to get some more insight into the Kashrus status of Yogurtland, and other similar frozen yogurt franchises. I know that many (if not all) of their flavors are listed on the KSA's website as Kosher, with the caveat that they are only certified when in the original sealed container, which- for obvious reasons- is near impossible to obtain in a retail setting.
I've corresponded with their corporate offices and been told that they are all franchises are required to obtain their product from the corporate factory. What I have been able to glean so far from a prominent Rav in LA is that he is OK with the U-Swirl chain, but not Menchie's, as their franchise models are fundamentally different.
I am not sure how this would apply to Yogurtland. In general, I am curious as to how much of these Psaks on Kashrus matters are founded in Halacha, and how much are based on the specific Rav's opinions and assumptions; for example - can a franchise store that is required by contract to obtain its product from one source be trusted to do so, or must we suspect that they might decide to find another, non-kosher supplier?
Is that a suspicion that is founded in halacha (such as the concept of Chazaka, or lack thereof), or is it purely that Rav's opinion on what liberties a company may or may not take? Would appreciate any insights.