With Terms of Service, users and the website have a legally binding contract. This is the agreement that will be setting the guidelines and rules in which users should agree and follow to be able to use and to access the website or your mobile application.
This is a common clause that you can also find in Terms and Conditions agreement. Within this clause, it is informing users that the abusive accounts could be banned and terminated from making use of the service.
Termination clause is focused on registration section. And website administrators have the power of banning or disabling any abusive users.