I could be wrong here, but all of the BOP places I know of require the customer to do ALL of the brewing work, maybe with the exception of cleaning/sanitation. I think once the BOP starts working with ANY of the brewing process, they legally are considered a brewery and have to follow all laws as such including licensing regulations, distribution and sales laws, as well as any beer/alcohol taxes.
I think it might have to do with your state's laws. In CA they are not regulated at all...or I should say that the same laws that apply to homebrewing would apply to a BOP. I have found that some states DO have strict regulations like you mentioned. Here is a FAQ from the TTB again....http://www.ttb.gov/beer/faqs.shtml#b1 It does mention what a BOP can and cannot do. However if you read it closely you will see that those are guidelines and not the actual law/regulation. Nowhere in the actual regulations are BOP's even mentioned. It just falls under homebrewing, which of course is regulated.