The blame should be put squarely on the shoulders of tophatter.com. They know the quality of what is being sold and choose to look the other way for the sake of making commission and sales fees on these imitation goods. In my estimation and also the interpretation of the law this is outright FRAUD.
Inverse operations are opposite operations that undo each other. Addition and subtraction are inverse operations. Multiplication and division are inverse operations.
Between the promoter sequence and these genes, there is a sequence called an operator at which a protein, known as a repressor, can bind and block transcription by blocking the binding of RNA polymerase. This system of promoter, operator, and gene(s) is called an operon.