This is a moderation tool that allows mods to keep disputed content online while not making it easily visible or promoting it.
The content would be blurred out or covered by a warning that this content contains sensitive or otherwise objectionable material (and the nature of why it's being covered), with a button to reveal that material.
This could include misinformation from important political figures, or images that are explicit but newsworthy or culturally important.
This could also allows regional distinctions so that something labeled by one region as sensitive could be automatically shown in other regions (e.g. proscribed depictions of religious figures, symbols that are legally considered hate speech in some countries, &c.).
The reveal buttons can also be disabled for users who are not yet adults.