This didn't happen all of a sudden in Sept 2021. The flu vaccine has always been about harm reduction and began seeing widespread civilian use in 2007-2008.
I won't go on, but by definition, a medicine that you take that's intended to build up your immune response to a disease is a vaccine. I saw someone upstream write "Intramuscular/serum vaccines cannot stop respiratory infections, by definition," and as far as I can tell this is just point-blank wrong. Whooping Cough -- pertussis -- is a respiratory bacterial infection we've been vaccinating against with intramuscular shots since the 1940s.