How did you verify it was pure CBD? Do you have equipment that would enable such verification? Seeming to have the effect you expect from CBD is not reliable.
CBD's effect on COVID-19 is to suppress the over-reaction of the immune system causing congestion and breathing problems. It does not interfere with the viral life cycle. So, it is useless to prevent COVID-19 infection.
In vitro analysis suggested that, in principle, ivermectin ought to help block COVID-19 virus in several ways. That generated interest to see if it would help.
The more reliable each study has been, the less effect it has shown. Something working great in test tubes (and even in mice) and failing when prescribed to actual people is totally unsurprising to anybody who works in medical research. Something promising that actually turns out to work clinically is always astonishing.
So, discounting promotion by people do lack long experience interpreting medical research results is not corrupt SUPPRESSION OF THE TRUTH. It is simple honest reporting, is doing you a favor, and you should welcome it.