The simplest answer is those hard-hit countries have ran out of actual respirators MONTHS ago. You KNOW this.
Beggars can't be choosers. If the no-name 10-cent paper masks not certified by any science labs is all that's left, then to them it's still better than nothing, if only for the piece of mind. Hell, those are supposed to be one time use, but I know at the height of the shortage back in Feb, people were desperate enough to actually washes them and reuse until they falls apart.
It doesn't really work, ofcourse, and that's why so many Chinese medical workers in Wuhan got sick and died but none of the CCP members did. They got first dibs on the N95 respirators, and left the 10-cent paper masks for everyone else, as seen here at the Wuhan hospital:
On a related note, desperate people in Asia are also taking herbal remedies by the millions to protect themselves from the coronavirus as well, but your doctor will tell you they're full of shit too. Do you understand why that is?
Because your doctor is right, and it is.