Same thing happened with me There is a clear ambiguity in their approach and something dubious. I am an academic writer, an author of an IET book chapter and several IEEE papers. They gave me an assignment that took hours from me to prepare. They decided unilaterally it was unacceptable. Ok, they are free to define their measures but it is also the right of those who take time to write, to be given feedback. At least for them to know what they missed. It is also their right to know what the company's measures are before they waste their time in writing. And there is a suspicion that the articles' they receive in this way are either used as is or used as a nucleus for writing articles to earn free money by fooling writers to write. As employers, I advise you they are definitely not decent in the strategy; if at all these suspicions were unfounded, for that I cannot tell without evidence.

@Geili, I only got given the "references too old" excuse after I sent a very curt email to them. I expect if you demanded feedback that you would receive a similarly spurious excuse. Tempted to report them to the Better Business Bureau, as what they are doing is theft. They also claim that all their writers are Oxbridge graduates - another lie.