Idk, I have a brother that was double jabbed and boosted and he still got it. Granted most of my family with similar vaccination records never got it at all. Meanwhile an aunt who never vaccinated never got it either while other family members (many with pre-existong conditions) pre-vaccine passed away from it early on. Not sure if its worth worrying about to the extent that it seems out of our hands but still worth keeping tabs on in case something changes. Seems a little random sometimes but mostly consistent with the idea that people with pre-existing conditions are the most at risk but there could be other reasons why some that dont vaccinate dont get sick. If its diet related for example that would be very useful to know.