Perhaps.

But you still need to launch that junk from its current orbit to wherever you want it to go, and then soft-land it (if you're aiming for the Moon).

The average satellite will lack;

a) Fuel/engines to perform such a task

b) the same for capture/soft-braking manoeuvres

c) structures/resources to allow it to land safely (legs, power, etc.)

It's like saying I could go down to the beach, and cobble together a boat from discarded plastic and wood.

I could.

Or I could build a ship.