Low flybys are not prohibited maneuvers in the US, as long as permission is granted, when required. It’s also probably a good idea the PIC has permission from the higher ups… especially when they are onboard the aircraft too.
Are they fun??? You bet they are. But you need to know the meteorology, geographical and wildlife layout of the airport you are going to perform such maneuvers. Imagine one bird being sucked into one of those mighty motors? The insurance would cover such a loss since the aircraft was being operated out of its normal criteria.