Upwork, fiverr, freelancer also have jobs posted which are for fake reviews, even though the job description is cleverly disguised as a a blog post or some other innocent thing.
I don't find that surprising at all. When I looked through Upwork job postings during a period of unemployment, I saw a post from a restaurant asking for a coder. The job was to create a script to cheat in an online poll from a local magazine. The poll would be used to determine which restaurant would get an award and be highlighted by the magazine, so the restaurant had an incentive to cheat. Naturally, Upwork refused to remove the post.