I’m not a vaccine conspiracy theorist but just as a counterpoint, Pfizer and then J&J have been selling completely ineffective Sudafed PE for more than a decade.
Phenylephrine was approved in the 70s and classified as "Generally Recognized as Safe and Effective", which allowed companies to start selling it in pill form without going through the normal approval process as soon as Pseudoephedrine started requiring ID to purchase. Dozens of companies sold versions of this not just Pfizer and J&J.
This isn't in any way comparable, because thousands of doctors and dozens of medical groups have been pointing out that it's not effective for years. There was no effort to "silence" any of them, and no requirement to pay off or even convince regulators and law makers to do anything in order to get it approved. It just took time for the wheels of regulatory momentum to do anything about it.
If anything it shows what happens when a bad drug is approved or starts being sold. Thousands of doctors and dozens of reputable medical groups start speaking up--no global Pharma conspiracy can keep them from doing so.