I've never used PM, but just ran through sign-up for their free service. What could they do differently with regards to this issue? Simple. Make the legal limit

I've never used PM, but just ran through sign-up for their free service. What could they do differently with regards to this issue? Simple. Make the legal limitations of their service -- or at least their understanding of them -- explicit, transparent, and above all, utterly conspicuous to anyone looking to use their service.