Other than the cost sharing element, which apparently both EASA and the CAA have approved, what is the legal difference between these flights and those that might arise from the
Spare seats Available / Desired sticky thread at the top of this forum?
Also, what is to stop people sharing a flight arising in that way from agreeing to split the costs?
In both cases, unless already known to each other, neither the pilot nor the passenger knows anything about the other (except that in the case of Skyuber / Wingly there is a pilot profile).