Why does Xiao Ye app send a message when it is deleted?

Some apps on Android phones will send you messages after they are deleted. This may be because the message reminder you opened on the application has not been closed or the account has not been cancelled, and he will send you a message. If you delete it, the phone doesn't appear on the surface, but it doesn't mean that your account has disappeared. If you don't want to use this application, you can choose to cancel your account, and this will not happen.