Fyre Festival was a scam from the perspective that they were selling something they had no means of fulfilling. This became evident early on, and rather than refund/notify customers, the Fyre team intentionally hid information and pushed attendees to load more money onto a vaporware payment system that didn't exist.

Even in the Netflix doc, it was shown that the founder, Billy McFarland, was raising festival funding under falsified information. The fact that he went on to scam the Fyre account list with fake tickets later just shows that he was scamming from the start.