Cafes - lunchbox policies

Our local cafe has recently introduced a "Children's menu" and has a "no BYO" policy ie you may not bring in any food from outside the cafe and eat it in their premises. This includes lunchboxes for under 5's. Bad move I reckon. This excludes anyone from dining that has children with special diets/wheat allergies etc. From a personal perspective, I choose to give my child organic food by preference. If I can't take my child's lunchbox there, I'll spend my money elsewhere. What do you reckon?