Geneva is one of EZs busiest routes at any time of year, and with a 90% load factor across the company this summer it doesn't take many skiers to make that 100% on some routes.
As to cancellations and "holiday plans trashed". Skiers are very fickle people, the snow is fickle too. Many of the ski destinations, Grenoble, Innsbruck etc are thin routes except in peak ski season, and that's when there isn't a recessiion threatening & people avoiding top-end hols like skiing. As soon as the snow looks less than perfect the skiiers go elsewhere, or just don't go at all. Either end of season the ski flights are usually hideously empty - and for a company fighting to operate in the current climate, and looking at 90% load factors to make it all work those destinations probably just aren't worth the bother.
Then those grey-faced, fish blooded accountants step in...economic necessity, they say.
There is no excuse, however, for not making refunds easy when flights are canx. Fight it.