Because they achieved what they were trying to do? They said if it got 50 seconds into flight it was a success and it did. No Spin, they literally mentioned this objective before the flight, it's more wild for people to suggest that it wasn't despite it exceeding it's objectives.
I listened to Musk give a QA about this last week before the initial launch date. He very clearly defined success as reaching orbit, and stated that success wasn’t likely.
