People are creating job sites and announcing them here almost every day. Is this working? Isn't there a chicken-and-egg problem in there? If it works, someone

People are creating job sites and announcing them here almost every day. Is this working? Isn't there a chicken-and-egg problem in there? If it works, someone please tell me what is the magic strategy to get public for a general (no devs, programmers or IT in any form) job postings site that is simple, easy and works. Brazil is in need of it.