Aldi don't pretend that their brands are the famous brands and they don't stock the expensive ones so making cornflakes look a little like "Kellogs Cornflakes" is probably more about customers spotting them on the shelves than trying to get customers to buy yours instead.
If Kellogs claimed trademark infringement, it would be hard for them to prove that they are losing out since Aldi would simply say that they don't sell Kellogs and people aren't in any way being tricked into thinking any of the Aldi brands are real ones.
Aldi don't pretend that their brands are the famous brands and they don't stock the expensive ones so making cornflakes look a little like "Kellogs Cornflakes" is probably more about customers spotting them on the shelves than trying to get customers to buy yours instead.
If Kellogs claimed trademark infringement, it would be hard for them to prove that they are losing out since Aldi would simply say that they don't sell Kellogs and people aren't in any way being tricked into thinking any of the Aldi brands are real ones.
caveat: I'm no lawyer!