What are you hiding from, agencies?

Today I decided to engage in some reseach and looked at 14 of the most popular nationwide tuition agencies' websites. Only two had any express mention of who was running the show. Why do tutors and pupils part with sensitive personal data to companies with no "face". I am proud of Tutors' Alliance and I want to put my name to it. I don't want our users to have to search through page after page to find out the slightest detail about who I am. What are the agencies hiding from?