Basically, fake
cereal, not (che)real. Chereal is most likely cheap, because it makes it easier to compete with the brand they actually copied.
These brands are also usually named
something nearly the same, something that means the same but is basically just a cheaper version.
The brands also have an image that relates to the actual brand it is bootlegging, as well. Or something completely
random. Like an image of three African American kids running after a kangaroo.