Masks, or the vaccines, both work and don't work. Neither is 100% money back guaranteed. Pretty much nothing is these days. Someone who vaxxed is less likely to contract covid and less likely to die from it. If you are vaxxed, wear a mask, and distance the layers add and your probability of dying from covid plummets. I've also heard that with each variant covid becomes less virulent, less stable and is basically "falling apart."