Which other countries?

I'm sure I'm simplifying things, but I think this ban is common practice at this point in most of the EU, Canada.

Where else is hypercouloring cereal common?

The food additive laws vary a great deal between countries, even US/Canada/UK/EU/Japan. It's pretty eye opening.

A side effect is these substances may continue to be distributed in other countries.

If RFK gets his way there will certainly be things spreading to other countries.