It wouldn't bother me at all if people posted recipes with [whatever] substitutes but, if anyone doesn't like a particular food for any reason, they could always skip that particular challenge. I would skip any under the category "fish" because I am so horribly allergic to all seafood even reading a recipe makes me feel queasy, although I must admit that
@morning glory 's recipe in my melon challenge didn't bother me too much because it wasn't obviously seafood. In fact, I've been racking my brains trying to think of a substitute that goes with the other ingredients and doesn't detract from the idea behind the recipe. It would be interesting, though, to see if anyone could come up with a fish substitute without resorting to an entirely different species. Having said that, I'm always "tinkering" with recipes and have been known to substitute chicken with potatoes (especially in spicy recipes) just for a change