Used by an experienced rider who knew what they doing, maybe. But by a child at a pony club rally I'm very shocked and as MrC said disappointed. I'm surprised they were allowed to use it. I think the pony club has changed a lot and there is a lot of "quick fix teaching" also think it varies a lot from one PC to another.
For example one pony I know went from a snaffle in a cavesson noseband to a grackle and dutch gag and is now in a Waterford gag. I broke and taught the pony to jump and I never felt he was strong, he was sit on your bum to slow type. Now he's hyped up at just the sight of poles, can't bend or do any decent flatwork, has a 4 beat canter etc. There's kids at my yard who part loan riding school ponies, one's an ancient little 12hh the child has draw reins on it to "make it better a dressage" all ok'd by the YO, makes me sad to see.