It's a group of people (I think they either know each other or at least are in contact) and their posts are only about 2 themes, black and white photos or flowers. Each of their post is translated in 5 or 6 languages and contains 90% of generalities (example: history of photography, how to take black and white photography...)

What they do

They take the text of their old post that is between 5 and 8 days old (it depends on how many unique posts they have), they change the order of the translation (for example if Spanish was before English, they put it after in the new post), add a beginning text and new photos.

Doing text comparison requires a lot of processor resources (especially when the order is different) and a dedicated analysis database (blockchain queries being too time consuming) that's why bots are easily fooled.