The author is not allowed to withdraw submitted manuscripts, because the withdrawal is a waste of valuable resources that editors and referees spent a great deal of time processing submitted manuscript, money, and works invested by the publisher.
If author still requests withdrawal of his/her manuscript when the manuscript is still in the peer-reviewing process, the author will be punished with paying USD 30 per manuscript, as withdrawal penalty to the publisher. However, it is unethical to withdraw a submitted manuscript from one journal if accepted by another journal. The withdrawal of manuscript after the manuscript is accepted for publication, the author will be punished by paying USD 30 per manuscript. Withdrawal of manuscript is only allowed after the withdrawal penalty has been fully paid to the Publisher.
If the author doesn't agree to pay the penalty, the author and his/her affiliation will be blacklisted for publication in this journal. The blacklist will remain until 5 years.