This isn’t necessarily true. A lot of encampments develop social roles, there’s often someone who can tend to wounds, someone who knows how to cook anything using a wide variety of heat sources, someone that keeps track of the individual needs of everyone else at the camp, someone who can cut hair, someone who collects stuff for distribution within the camp, etc.
In a lot of cases physical donations will end up at the camp and either be shared when possible or redistributed to a specific person that can use it.
There are of course unhoused people that don’t make it to camps or who have left camps, and if they resell the boots, so what? You’re still helping them.