I have enjoyed all of those and the Stockfighter attempt in this space as well. They all seem to have hit a hard obstacle in convincing the general, non-FAANG hiring market that they can provide "better" candidates that any old staffing agency. I have definitely had hiring managers in non-software companies tell me that they will just pick from three resumes from a staffing agency of a standard enterprise developer job without much actual consideration of the candidate's resume or portfolio of previous work.
I do suspect there exists a category of higher-end headhunter agencies with a stable of high-quality, proofed candidates that those agencies can more successfully place than other attempts. Just an anecdote, but I have seen in my area some things that look more like a "small team" placements where that team has some history of helping companies radically improve their software quickly. I am specifically thinking about an actual team that gets hired as a group but into fulltime roles at a company as a unit. This seems to be a prequel to an acquisition of the company that hired them being the end goal. Then that entire team seems to repeat the process elsewhere . . .
I do suspect there exists a category of higher-end headhunter agencies with a stable of high-quality, proofed candidates that those agencies can more successfully place than other attempts. Just an anecdote, but I have seen in my area some things that look more like a "small team" placements where that team has some history of helping companies radically improve their software quickly. I am specifically thinking about an actual team that gets hired as a group but into fulltime roles at a company as a unit. This seems to be a prequel to an acquisition of the company that hired them being the end goal. Then that entire team seems to repeat the process elsewhere . . .