Well, consider all the money that pharmaceutical companies make every year on over the counter medicines for cold symptoms. I’m sure it’s not a perfect example of malfeasance like “hey, we have this perfect cure for the cold in our pockets but we make more profits from our over the counter cold medicines so let’s just bury the cure”, but through a complicated process they often end up at a similar result.

Recent example: https://www.propublica.org/article/how-big-pharma-company-stalled-tuberculosis-vaccine-to-pursue-bigger-profits