I totally agree! But I've got a quick question...
I know ignorance is not a defence, but some sellers might say they really didn't know there was a difference. The question is, if they use "Transformers" in the listing, then it has to be a "legit" Transformer, right? But, just putting KOs aside for one minute... how many GoBots or Machine Men do we see listed as "Original Transformers"... surely that's misidentifying those items too, isn't it?
Now, Machine Men aren't KOs, but they're certainly not Transformers either! Yet both MM and KOs are often listed as genuine TFs!