It's a SCAM because they don't clearly tell when you sign up that "Resubmissions must be at least 70% similar to the original document. Resubmissions cannot be more than 150% the length of the original document." Many people pay and submit their paper only to find out they cannot get resubmit after they have considerably edited their paper. The info about limitations only appear when you try to resubmit or if by chance you happen to read their FAQ. It's a SCAM