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Hmmmm green eggs would be worse. IMHO
BTW, DD and I find the gel food coloring has an off flavor. Maybe that’s what they used.
Any food coloring has a taste when used in anything but minor amounts. When I was decorating cakes and needed dark colors I always used paste coloring because gel and liquid food coloring weren't sufficient to get deep colors. I tried to always talk people into using the dark colors as decorations only and have the frosting in a lighter color because of the taste change.
Case in point, red velvet cake. Make it without the red food coloring and it doesn't have that distictive flavor.
I'm sure they used an emerald green paste coloring because the inside of the doughnuts is a bright emerald green.