To be fair, people are generally coming around to it and it's kind of on it's way to being a cult classic now. People say this about everything but it was actually ahead of its time in terms of its visual style and the way it deals with the serious elements within the wild cartoon visuals.
Weirdly, I kind of think Marvel movies like Guardians might have been the thing that tipped the scales. The breakneck editing is still way ahead of anything I've seen since though.
They don't show the labels because the brand didn't pay. If you see a label with a brand on it they probably paid.
For a cooking show it's probably not going to be worth the time and effort to get a contract in place for every ingredient, so you only see it occasionally.