Besides the high risk to themselves, those flights involve SAR from various nations and often flow and landings at large airports with airliners, which those entities never asked to get involved with.
As an aside, the US Navy ended up searching for Amelia Earhart, so that shows the disruption of these flights.
Besides the ones who have died (Dubroff, etc.), it turns out none had the training to reasonably attempt the flight.
https://en.wikipedia.org/wiki/Jessica_Dubroff
Besides the high risk to themselves, those flights involve SAR from various nations and often flow and landings at large airports with airliners, which those entities never asked to get involved with.
As an aside, the US Navy ended up searching for Amelia Earhart, so that shows the disruption of these flights.
https://en.wikipedia.org/wiki/Amelia_Earhart