There may be a slight bit of virus mitigatasion with masks based on studies, but the public use is significantly different than a controlled lab. People touch, re-use, cough and sneeze into, and re-contaminate their unsanitary masks in public.
Mitigation.
AND.. masks are totally used wrong. No collection points to collect and store used masks for proper HAZMAT disposal. no protocol for proper donning and removal of masks, no time use recommendations for wearing of masks, no recommendations of when to change masks, etc., etc.