there other airports that LBA and DSA are fighting against
They are not fighting against except in the mind of a spotter, LHR offer their product, LGW theirs, STN similar, MAN is the metropolis airport of the north and then there are regionals all over the place, including LBA and DSA.
Is anybody suggesting that STN is poaching NWI's potential passengers ... No of course they're not because they're two different markets and nobody really cares a sh1t ... Alas in Yorkshire it seems you have a renegade spotter