XRP army be like "yo we can do that for one tenth of a penny and in 3 seconds"
In this specific case it helps that there is not much network congestion, otherwise the fee would have been higher, but it just shows that we don't need to pay financial institutions $50-$100 to move value from one account to another.
Maybe that these developments within crypto will reduce the cost of the legacy banking system, but I have my doubts. If there was an incentive for them to do so banks would have done it already, but they are fine letting people overpay big time.