I think that ever since penacillin, we have become so used to high-tech magic bullets, we don't have time for simple, effective measures.
Yes, someone I know here has been reading for a few weeks about masks used during the Spanish Flu epidemic. She said that many of the people then wore four or five layers of cotton cheese cloth back then, because the cheese cloth was readily available but not woven tight enough for appreciable effectiveness with one layer. She also said that the Red Cross might have some history archived about that, because the Red Cross was issuing some of the information.
She’s also a millennial, BTW, one of the few very conservative ones with a general interest in all things old fashioned (especially tech stuff including textiles).
Wearing masks is much preferable to shutting down and staying at home. Those people appear to be working or traveling freely.