If the number is only 17%, I'm not sure we need to ban them.
From my experience the big issue is hiring managers who either 1) are very casual about hiring (i.e. they're willing to wait 6 months and waste everyone's time), or 2) people who like the idea of hiring but keep changing what they want to hire for (like this month we're having issues with testing, so we want a test engineer, but next month we're having issues with embedded software, so we need a new embedded engineer.
I really don't think there are bands of hiring managers posting fake job ads to make their company look more impressive, I think it's just bands of hiring managers who want a senior engineer with direct experience for <140k
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