Due to various security reasons, it may possible that Cash app delete account activity. But, before deleting anything from your account, you will definitely get a prompt on your screen, and it ask for your permission. You can say that deleting account activity is good for security reasons, so you can secure your account from hackers.
https://www.monktech.us/blog/how-to-delete-cash-app-account/
Does Cash app delete account activity?