This is a commercial decision by Wizz, in the face of competition from FR. Whilst GLA (or any other airport) could provide startup assistance, the suggestion of underhand tactics is wide of the mark, IMHO.
I can't see the difference between BAA-LHR Ltd money and GIP money, neither are publicly funded.
Joe, the gloves are off. EDI will win some, GLA will win some, and maybe PIK will survive in some way. What goes around comes around.