A very active robot is making (random) posts in a community with a strange name, that is :
Anime Titties@mlem.a-smol-cat.fr
…it looks like a deliberate attempt to discredit Lemmy.
Robot
@Mehddit@mlem.a-smol-cat.fr is the only poster in there.
Should be defederated or admins be called.
The basic lore is that the r/worldnews subreddit was unmoderated which allowed for low quality content to be spammed, the users of the subreddit decided to protest the lack of moderation by turning the subreddit into nsfw anime spam (and later 3d) completely unrelated to news. As a response the r/anime_titties subreddit was created as the new source of actual world news, which is what the bot linked in your post seems to be mirroring. You can check the subreddit on reddit itself it’s completely safe for work.