Not for developing countries. And ultimately it is important for them to get vaccinated too, otherwise they will form a huge reservoir of COVID that will inevitably mutate and come back around to us.
Yes it has, most recently in 2009. From Wikipedia:
“ Well known outbreaks of H1N1 strains in humans include the 2009 swine flu pandemic, as well as the Spanish flu.”
The “Spanish flu” is the name of the 1918 outbreak of H1N1. There was also a major H1N1 outbreak in 2009.