That's bluetea humor.
CB is chock full of spam ads, fake ads and recruiter ads. I'm being redundant in naming all three.
I don't respond to recruiter ads on CB. Period. End of story.
Ads on CB where the employer is named, you can take as legit.
Ads that are blind, you should read very carefully to determine if they are fake and/or recruiters. If the ad references "our client" or "this company," it's a recruiter and you can forget about responding.
Overall, CB is full of garbage/fake/spam/recruiter ads. I may find one ad every week or two there to which I can respond. Some are just bad hits or in areas where I don't have experience that are legit. I'd say it's around 5% legit ads for me, and 1% to which I can respond. Recruiters and agencies post 80% of the ads on CB.
CL is a better job site.