Nextcloud SMS is a free software developed by its contributors. This privacy policy is intended to inform you about data gathered by this application."
Only SMS and call log are collected by the application.
Information is neither sent to Nextcloud team servers nor Nextcloud SMS team servers nor any government nor another entity you don't want.
When you configure a Nextcloud account in the application, you agree with the Nextcloud instance owner that your SMS and call log data will be stored in his infrastructure under his responsibility.
We don't recommend to use a public or a company Nextcloud instance account. Your privacy must be under your control on your own Nextcloud instance.