There's a lot of time wasted individually by candidates vetting companies. For instance I've had to resort to using OSINT techniques and public records to weed out fake jobs because my cold interview->conversion rate is abyssal (1:1000+).
I've seen companies and positions being advertised where when you look up the secretary of state info, its either been shut down/suspended, or the directors/owners listed are dead people (i.e. semi-recent obituaries +- 1 year). The positions posted are always newer than the deceased person. I've also seen a lot of business info posted resolving to a UPS store address. Definitely presents as red flags when looking.
It would be useful to be able to crowdsource a lot of the due dilligence that must be done individually that could easily be automated as well as see the average turnaround time before rejection, and identify job postings that continuously roll (identical and reposted every 3-6 months)