Well from that, this to me sounds like the above was the only service which they have asked to be paid for, like moving a free tier where you've made an account to a paid service.

Usually services are provided only after the customer has paid. Those that don't are either incredibly generous and trusting ... or absolutely precious. In regard to precious, in my rule book for all business and personal purchases, they are deserving a close and critical eye with an expectation of a poor and bad outcome to surface, and being prepared with a contingency plan having already shopped around without being in a panic, should the moment arise. I think it's fair to say some smaller and newer companies providing services have tight spots as well, and generally resolve as the company grows.