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PayPal does review accounts regularly, and any concerns with security, violations of the User Agreement or Acceptable Use Agreement, compliance obligations, etc., could lead to a permanent restriction. Additional information beyond what would have been provided to you in a notification and/or email would not be available due also to security concerns and due to such information being proprietary.
However they don't ban you for 0 reason, what would be the point? It would be counter-productive as they want us to open and use paypal accounts as that is how they make their money !!
This is their land and they can do whatever they do I guess. Guilty without evidences and without witnesses.