Do you prefer to see 10 posts from my company, from each hiring manager with open positions?
But I can also see why it seems inconvenient to have many people from the same company post as well.
On the other hand, an in-house recruiter, an outside recruiter contracted by the company, the actual hiring manager, just a peer or colleague, the company's receptionist... I think all these should be allowed.
If we're going to cut one more cohort from the above paragraph, cut the 3rd party recruiters. However, excluding all talent acquisition teams and/or other co-workers within the company seems unnecessarily restrictive.
Only large(ish) companies have recruiters that are also employees. Most small startups have no one in that role, and medium sized startups would be more likely to have a freelance consultant than an employee. (Our startup has used a consultant for more specialised or senior roles).
Its seems strange that we'd want to let the Google/FB/Apple etc HR folk post, but not "Sally Smith, consultant to UltraSecretLabs.io"
It seems the easiest rule is what you suggest, ban them all - you can only post roles that you're personally involved in.
Just my 2¢.
What about recruiters who are full-time employees of the hiring company?
I think a stronger restriction, namely "you should only post about positions which you will be personally involved with" would make this more even useful -- we don't need to be told every month that Google, Amazon, Microsoft, and Apple are hiring, but if tptacek (to take a local celebrity as a convenient hypothetical) posted that Starfighter was looking to hire a sysadmin then potential candidates would be able to ask questions and anticipate getting useful answers.