It's usually not
all but there's an outlier in there somewhere. Many are critically ill. Some are on dialysis. Many are sick and yet refuse to take their medicine, and yet insist on doing heavy labor.
There's also some who can't go to the bathroom without help. These aren't dangerous, but they require a lot of attention. There's dementia. There's people who poop on the ground then sort their shit.
But many overlap with the above - the ones who can't move about pick up all kinds of illnesses. Pills for both mental health and physical health damage the organs, and so on.
We do see them cutting costs where possible, but nobody can do this on their own in a shift. An old lady who has fallen off her bed can be carried by 1-2 strong people with the right technique, but you still have the others. There's also the question of nobody wanting to do so. We interviewed a bunch of maids to see if they'd take care of the elderly, and nearly all rated it as their last option, compared to watching kids, cleaning cat litter, cooking, etc. There's the legal liability of being the caretaker of a paying customer who's at death's door. Many of the people who leave them there do not care about them, won't even visit them during holidays, they're just paying someone else to watch them die.