Widthrawal of Manuscripts
Author is not allowed to withdraw submitted manuscripts, because the withdrawal is waste of valuable resources that editors and reviewers spent a great deal of time processing submitted manuscript, money and works invested by the publisher.
However, it is very unethical to withdraw a submitted manuscript from one journal if accepted by another journal. As withdrawal penalty, publisher will send official email to the author's affiliation, and the author and his/her affiliation will be blacklisted for publication in this journal.