>>thereby providing fewer incentives to the commenting user to spam the page or attempt to circumvent the social networking system filters. <<
I would think its just the opposite and would encourage whack-a-mole antics, as in many sockpuppets. just how many shadowban posts would a blog socmedia etcetera see as acceptable overhead to further the illusion of transmitted posts during a shadowban. i would think its a problem to carry a bunch of content, to show to only one person.
putting the grey hat on, it could make a beautiful online scratch pad, or even a dead drop so a number of people could use the shadow banned account to communicate exclusively with each other.