People who hoard can also do it as part of abuse and coercive control.
You aren't worth as much as the Stuff.
Your physical safety isn't as important as the Stuff.
Your ability to move around freely isn't as important as the Stuff.
Your ability to have a bath isn't as important as the Stuff.
You're walled in. Your space isn't as important as the Stuff.
You aren't worth unbroken things.
You aren't worth clothes or shoes that fit or aren't motheaten.
You aren't worth having a bed that isn't broken or a mattress that isn't 40 years old and with rusty sharp springs sticking out of it. And if it literally falls apart, it's your fault for being so fat and ugly, so you sleep on the knackered mattress on the floor like a homeless person.
You can't be allowed to think - the Stuff has to be constantly in your face, around your legs, closing in on your body, towering over your head.
You can't be allowed to breathe.
You can't be allowed to trust the safety of food.
You can't have anybody round - not friends (because YOU MADE IT LIKE THIS and they'll all hate you because you're the trampy, smelly kid covered in cat fluff and shedding the occasional cat flea), not Social Workers (because they might find out that you're being beaten if there was a space to talk to you privately), not workmen to install heating because 'children don't need heating', etc.
I've gone through a list of possible traumas my mother could have had. The nearest we can get to is that she was traumatised by
the 4th sibling being put on the At Risk register because she was battering him whilst off her tits on diet pills and tranquilisers. And that meant she might have had some of her property taken away. Him. The utter slovenliness came after that - build a wall (literally) so that nobody knows the next one exists until they're old enough to have to go to school.
That's why I think those photos are all just pathetic mock ups of what people think hoarders houses look like. A proper hoarded house isn't a house. It's barricaded with furniture, clothes, scissors, knives, glasses, trays, DVDs, videos, appliances, rotten food, mummified cat shit, 32 rolls of kitchen foil, 3 fridges and 2 massive freezers, infested with fleas, 17 year old grease in the chip pan balanced on top of the tins balanced on top of the grill, covered with grease soaked teatowels, cat bowls with food in them, an open litter tray...
If you go in and find that somehow, there is a place with no carpet, no heating, no hot water, but you were actually able to get in through the door without turning sideways and you actually had the edge of a sofa to perch on, you think 'OH MY GOD - IT'S SO CLEAN!!!', that's what a real hoarded house looks like.
Not a few clothes and some clean MccyD paper bags dumped on the floor for a photo opportunity.