They’re profiting off your attention. And the bad advice keeps them running in circles for answers.
Let me illustrate with the most braindead example.
Let’s say you had the best full body workout ever. It was so good that it will get you 1 additional pound of muscle as long as you consume your baseline calories. And let’s say that number is 3k calories. So 1 pound of muscle is guaranteed as long as you eat 3k calories. Assume the ratios of protein to fat are perfect.
If you eat 6k calories instead of 3k, you will not gain 2 pounds of muscle. And if you 9k calories instead of 3k, you won’t get 3 pounds of muscle. You will still gain 1 pound of muscle plus extra fat. The amount of muscle your body can add is based on genetics. Unless you’re on fucking steroids, you’re not growing more muscle by eating like a fat ass.