Lucky. Cautious. Asymptomatic. Subclinical (mild cold symptoms). Immune. Not enough initial inoculum for your immune system (not immune, just that you need a higher dose). Taking a substance that provides some form of passive immunity without realizing it (people are on a lot of medications out there at various doses at any given time). A combination of these things will be the only real way to explain away its relatively low number of infections for its R0, especially the first year and Omicron. The majority of the world should have been infected at least once by now (over 90%).
Most of my state should have contracted Omicron after several months, and they probably have. Unless unaware, I haven't caught it yet. To be fair, I kinda wear PPE because I don't want to catch it and pass it on to someone else. So, I wouldn't contract it anyway due to that.