The nature of the non-transaction was such that they were given access to a service that was constrained in certain ways. They used the service, and the constraints that AC technically applied still applied. They used what was available to them under the constraints and weren't required to pay for any other service but the removal of the constraints. I don't see how any theft occurred.

Likewise illegality is just a boring and simple way to dismiss someone on moral grounds, but laws are only as effective as the level of agreement people have with them. Drinking in the park is technically illegal, but I don't care, the police don't care, nobody cares, unless someone needs to care, and I'm going to do it anyway, because the law does not make drinking in the park inherently wrong, it just provides a framework for telling you to stop if you're interfering with others in a way that relates to alcohol consumption.