Yup, I’ve read the same thing a lot. Someone comes out with a new mass gainer and puts some real but illegal (whether by law or in sports) anabolic agent in it so that they can gain popularity. Then they remove the agent because it’s illegal and expensive but by then every amateur bodybuilder bro knows that “Muscle Blast” by GetYolkedRX is the best so they keep buying and recommending it.
A good example is the old Jack3D (a preworkout) basically had a methamphetamine analog in it (along with a shitload of caffeine) and was basically legal speed so every one I knew in high school would buy it. Then they changed the formula to a more toned down (and much safer) version.