

I’ve had postmix based energy drink in the Netherlands, so that’s not true. Ingredients are not held to the same standards as premixed drinks.
To answer op’s question, I think it’s more of a supply/demand case, and a postmix doesn’t display the brand as well as a can of an energy drink does (which is also marketing).
If it’s about Firefox, it means you can go to the dusty basement breakerbox that’s
about:config
and turn it on yourself.