They provided a link that indicated how that happened.
In short, the terms of service of Viper make it so that every single essay checked through it is, eventually, posted on one of a network of essay mill sites and there is nothing that the rightsholder and creator can do about it.
Viper, like most plagiarism detection services, has a terms of service.
While most of the TOS is dedicated to your license to use Viper and its software, a section entitled “Store and Use of Your Documents” deals with the license you grant Viper in the work you submit.
By those numbers, at least 93% of people who use Viper are, most likely, completely unaware of how their essays are being used.
This raises the question where this type of contract is legal and, if so, what can be done about it?
But while Viper does openly admit to doing this, their claims of being “transparent” ring hollow as the information is well-hidden on their site and it’s possible, if not likely, most people using the service are unaware that Viper is feeding their essays to various sites with the intent of making the available for others to use.
Unfortunately, this is just another cautionary tale about working with questionable plagiarism detection services and the dangers that they can pose.
Nowhere is there a clear statement that submitting your article allows them to republish it, on an essay mill site no less.
Unfortunately, according to studies, only 7% of people actually read the TOS and many of those who do may still not have seen it as the information (other than a warning at the top) is near the bottom.