Reputation laundering. A bot farm where every bot has only posted for the same pattern of apps (paid clients) is too easy to detect. So they try to break up th

Reputation laundering. A bot farm where every bot has only posted for the same pattern of apps (paid clients) is too easy to detect. So they try to break up the pattern by having bots randomly assigned a different subset of inexpensive apps (not paid clients). But you can’t do bad reviews because that would draw angry attention. So you give everyone 5 stars so they don’t complain. The bot farmers probably don’t understand why anyone would report inorganic good reviews.