Shadowbanning: The secret censoring by social media
newsweek.com
newsweek.com
That this technology, when available, invariably winds up being used against good-faith users seems to be the usual grubby-fingers problem where the powerful take away from the commons of social trust for a temporary advantage, akin to police using COVID contact tracing data to chase small-time drug dealers.
1. Sometimes it is accidental and some automated filter does this.
2. Sometimes it is done by a mod who didn't like what you posted, and shadowbans the post instead of deleting it. The hope is that you don't find out about this because otherwise you may enquire about the decision, and other mods will get involved in discussing it and over-rule the previous decision.