Are the restrictions actual prohibitions, or are they just suggestions of healthy snacks?
Because if they really won't allow you to send certain foods (barring food allergy concerns), that's ridiculous. I can understand giving a "suggested foods" list, but I'd draw the line at them telling me what I can and can't feed my own child.
My DSs played sports through the Y and they had a signup sheet to bring snacks for the team. They did have a suggested healthy snacks list, but some of the parents just ignored it and brought in cheetos and chocolate mini-donuts when their turn came around. I saw that as a little rude, since you're providing snacks for the entire team and not just your child.