Except if you bypassed payment and used the service in a manner that was not intended, most likely you were by definition not undertaking "strict adherance" to service terms ?
Not law per se. More like contractual obligations taken upon by connecting to the flight's WiFi.
This may be the dumbest write up I have ever read.
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.
I agree more with your second argument, though that tends to be strained when the exploit is published.
This is a court of casual opinions, but incidentally when all Air Canada employees recently went on strike—grounding and/or rescheduling all flights, including my own, and causing plenty of inconvenience—and were quickly ordered back to work by the federal government, basically everyone supported them continuing to refuse to work even though technically it was illegal because the government just decided it was. The government's move ended up backfiring and turned into a negative mark on their record after the employees basically won and everything went back to normal with more equitable pay. The CEO outright said they hadn't planned for the situation in which the employees just said no to the order.