Great way to get hooked on a bunch of monthly service fees when the introductory free period runs out. Reminds me of the Columbia Record and Tape Club.
I hate it when that happens too, but I don't think this is will happen in FbStart's case. We're a program partner and companies who get accepted get a code they can redeem on our site for 6 or 12 months free, depending on the track. No credit card is required (at least for our service, not sure about other partners), so if they decide not to subscribe at the end of the program, they can just go.
I think what Patja is saying is that after 6 to 12 months the users will have developed a dependency on your platform and will have to either cough up cash or replatform.
Makes sense, but that scenario is true for any freemium model though, not just free packages like FbStart.