They tried to solve problems (turbine protection for Altaeros, safety thanks to a stationary system and double lift, aerodynamic lift and aerostatic lift for Magenn).
In doing so, the problems created have been greater than the problems solved, which seems to have always been the case for AWE projects thus far and probably for an indefinite period.
It has not been demonstrated that a flying wind turbine can be profitable. Perhaps the opposite could be demonstrated, at least with current technologies or those envisaged in a possible future.