Just seeing this process gives me a better visual of how the behind-the-scenes marketing works, and I can see why people think it's "rigged" since, well, clearly they are using Photoshop (looks like it??) to artificially alter the burger to appear more delectable. "Rigged" wouldn't be the term I would use, though, because rigging something would be creating a system intentionally designed to scam someone. And from this video, what they're doing isn't scamming people.
What I'm seeing here is more like "deception" and "lying" for lack of better words. They're creating an artificially improved visual of the original burger to market it off better to children, even adults, which is something that has been going on in the fast food industry for decades. Doesn't really hurt anyone because you still have the choice of purchasing the burger or not, but still, it's deceptive, and it works off of the reward circuits of the brain.