Something about SF is a draw for homeless people.
According to a 2019 survey [0], only 70% of people were living in SF prior to being homeless, and of those 70%, approximately half had lived in SF for less than ten years.
To me, that's staggering if 30% of the homeless population was already homeless before they moved to SF, and if another 30% became homeless within 10 years of moving to SF.
[0] https://en.wikipedia.org/wiki/Homelessness_in_the_San_Franci...