Some things are healthier in other countries than they are in the United States, and that can be anywhere from food itself to the things for animals. Just compare the ingredients of Fanta soda from the USA to UK's ingredients. The same brand doesn't even look the same in the two countries.
I rarely use these bowls as they're just not my favorite thing to use. If I do use the one I have, it'd be likely to use for water, not feed. I prefer not to use mine because the birds will just step in it, and it's not large enough to last any amount of time. I have one because it is easier to...