FYI this is coming from the fediverse (mastodon et al) bridge.  In certain clients you can set media from people you don't follow to be blurred by default and if media is set as sensitive it can be set to not show by default.
https://image.nostr.build/799dda5b018556a26dc1988914887c1795fd2f8bf4294143d0fec365145134c0.png