Type 3 is easily 90% if not almost all homeless people though. Maybe it varies by city, but I volunteered at a shelter when I was in high school and I had this naive idea of people "just down on their luck" or mentally ill and that's just not the reality.

Most people travel a pretty long road of exhausting the charity of their family and friends before they end up on the street. And those that are just mentally ill usually have an easier time getting sympathy then people who are addicts.

Idk my time volunteering made me pretty pessimistic about the entire situation. The shelter basically became a trap, an encampment would pop up a short walk away, the city wouldn't do anything about it and these people would use and then crash out in front of the shelter in case they OD.