well, it depends — I wear the mask not for myself, I’m in my 40s, not overweight and fit enough. I’m guessing I MAY have got the virus sometime in early April as for a day I had breathing problems I’ve not experienced before. Ok, big deal, I took paracetamol and the next day was weak but ok. However, if I had gotten the virus, me wearing a mask lessened me giving it to other people.
People of course took this to extremes - in both ways - the wear plastic all over you crowd and the no-masks, no nothing crowd.
The right way was in-between - wear the masks and be hygienic.