Fortunately, for the purpose of answering this post, I claim to have no knowledge of Borek's operation. Thus I will express no opinion, other than it seems Borek has conducted effective, and sometime amazing business in worldwide avaition for a long time. A record to be proud of...
It does seem to me though, that carrier is trying to elicit information to fulfill negative assumtions about the company. Honestly, if you have that many concerns about how an established operator conducts their business, why bother to ask at all? It does not seem that a pleasant relationship with this company is what you're looking for in the first place!
Just let them go their way, and you go yours...