I briefly worked for Imbue, and got paid for it, and as far as I know they are still legitimately hiring -- their current team page shows a good number of people who have been hired since I was there -- so I don't think "spams fake hiring ads" is a fair thing to say; they are legitimately hiring people, and paying good money. My impression is that they make the top of the hiring funnel as wide as possible but end up hiring a tiny fraction of the people who start the process.