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.
Exponents and Logarithms work well together because they undo each other (so long as the base a is the same): They are  Inverse Functions . Doing one, then the other, gets you back to where you started: 1  Doing ax, and then the logarithm, gives you x back again: