have you been living under a rock or something?
No, but I live in sparsely populated area where wearing masks outside never made any sense. I understood and followed the mask guidance from the beginning. It changed over time as understanding changed and cheap, washable cloth masks became widely available.
A coronavirus, like carbon dioxide and oxygen, can pass through a cloth mask. Luckily, a random virus won't make us sick. Colonies of viruses attached to respiratory droplets might, if we inhale enough of them. Respiratory droplets are ejected when we cough, sneeze, talk, sing, pray out loud, etcetera. The greater risk of infection appears to be from super spreader events, crowded indoor activities at locations with poor ventilation; where the viruses can become aerosolized.
A cloth mask can be somewhat effective at blocking incoming respiratory droplets. The main benefit is acting as a barrier for outgoing droplets. If everyone wears a cloth mask, the chances of transmitting the virus are greatly reduced. If someone is walking outside alone, with no one else around, no need to mask up. Walking in a crowded downtown of a big city, different story.