How will these robots be ejected from the body (see note below) and what other application they may have? I look for most sinister applications possible, disgui

How will these robots be ejected from the body (see note below) and what other application they may have? I look for most sinister applications possible, disguised as beneficial. Asking for a friend, of course. Note that human immune system cannot properly dispose particles above some diameter. This is the reason for silicosis and is a reason why tatoos do not disappear after some short time. In my view, this "invention" is more harm than good.