First of all, you need to understand who has the authority to close your Cash App account. If you don't have deleted the account then who can delete your account? Only you and Cash App can close or delete the Cash App account. But, the question is, can Cash App delete your account for no reason? Not at all, Cash App never delete the account without any reason. 

You know that the Cash App has different payment features. Once you open the account on Cash App, you are entitled to send or receive payments easily. You can also withdraw the money from the ATMs using Cash Card. Investing in Bitcoins/Stocks is also quite easy. Cash App monitors the activity of the users for any violation of terms of services. 

If Cash App found any activity that violates the terms and conditions laid down and is serious, it may lead to account suspension or deletion. In such a situation, Cash App can delete your account without any prior explanation to you. Generally, Cashapp deletes the account for violation of the rules and to protect the users from any possible online fraud or scam. If your intention was not wrong and you mistakenly violated the rules, you can approach customer support and can request to open the account. 

The Cash App may or may not accept your request as it depends on your identity verification and the type of violation you made. You need to answer all the questions raised by the support team to get access back to your old account.