Everything about various risk-reduction measures for the Corona virus/variants are ill-conceived. The so-called vaccinations are ineffective, physical distancing at 6 feet is not based on science but on guesswork, covid tests are not a valid diagnostic as the tests produce an inordinate amount of false positives & many nasal swabs are sterilized with ethylene oxide, a highly toxic odorless gas, and other dangerous materials.
The CDC admitted in 2021 that masks don't protect you from wildfire particles which are larger than respiratory droplets. I think it would be difficult to determine the effectiveness of masks, given the myriad types of masks, how they fit to one's face, various conditions, quality of testing equipment and are people infected.
I do think the bigger issue of face masks is that masks are the source of bacterial load on the wearer. According to the NIH in 2017, there are about 50-100 billion bacteria in the oral cavity. Again in 2020, NIH reported that a mouth has 700 species of microscopic organisms like bacteria, fungi including fungus in plaque, single-celled bacteria called archaea, and viruses.
In 2018, the NIH conducted a study of surgical masks (SMs) worn in the operating room. The study concluded that the source of bacterial contamination in SM's was from the body surface of the surgeons rather than the operating room environment. The study provided strong evidence that the source of bacterial contamination should be a cause for alarm and attention in the prevention of surgical site infection in clinical practice.
The only accurate data has to do with Pfizer's revenue that soared on its Covid vaccine business, thanks to governmental contracts which guarantee annual purchases of the so-called Covid-19 vaccines. Total 2021 revenue was $81.3 Billion with $36.78 Billion from the vaccines. Income for 2020 was $41.7B and for 2019, income was $41.2B.