I think it would be good to be clearer in our communication and say that we don’t consider local opera houses, pet sanctuaries, homeless shelters, or private schools to be good cause areas, but there might be other good reasons for you to donate to them.
I made a similar claim here, regarding carbon offsets:
https://forum.effectivealtruism.org/posts/brTXG5pS3JgTatP7i/carbon-offsets-as-an-non-altruistic-expense