I think people who are into crafts. They have all of these yarns, construction papers, various tools and stuff. All so that they can say that they have all of these projects in mind that they want to do. But they never do them so they get more crafting stuff and it just eats away storage until their place is practically consumed by it.
People who pick stuff off the curb, refurbish it, and resell it.
My neighbor (apartments) does this but mostly around the time rent is due because she doesn’t have a job. She leaves her shit all over the property: half-finished furniture, tools to move it, etc.