Instantly that felt completely insane to me, my bullshit detector went off the chart, so since they provided a source, I followed up on the source to see the evidence for myself.
What do you know, the source is from a "my perfect resume" website that apparently conducted a study on the issue, but they aren't providing the details of the study, aren't providing a paper , aren't providing the methodology or questions asked, aren't providing any details whatsoever, the only thing they provide is the "conclusions" of their study.
So, apparently because this random website supposedly conducted a study, and they say the result was "81% posted fake jobs", that makes it true.
Hey, I also conducted a study, and 14% posted fake jobs. There, my claim has just as much backing as theirs does.
Instantly lost interest in the "study" and the article based on it.