It’s a valid opinion. The principle is regulatory capture and it happens when a regulatory agency isn’t competent and effective enough to remain independent in its acquisition and evaluation of knowledge. Likewise, the “capturing” is not malicious but happens when the pharmaceutical company persuasive over time, or, in extreme situations, when it appears to have the only solution. This can be exacerbated by inherent limitations to the industry in question, e.g. the difficulty of conducting long-term medical trials in an emergency. Regulatory capture is a natural drift and so believing it has occurred does not require believing in a conspiracy.

(I haven’t studied whether it’s happened in the case of Pfizer boosters.)