I have created and posted a job request successfully, yet few minutes later, I have received an email that my job post have been removed as it was interpreted as a job post was requesting unpaid work from a freelancer. I don't really know why Upwork system recognized my post in that way.
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It is very difficult to create automated algorithms which "read" human-written text and come to proper conclusions. Upwork does its best, but its automated algorithms are not perfect.
So there acan indeed be "false positives" which result in a job posting being flagged or blocked or removed even though the job posting does not violate any Upwork ToS.
This has happened to me as a client. Sometimes I have posted jobs which were removed or blocked, even though they did not violate any Upwork rules. I was able to re-word them to avoid problematic phrases or words, and successfully post a job and hire freelancers.