ALTER DEFAULT PRIVILEGES FOR ROLE

After a database was updated by the application, a schema dump showed the following default privilege statements:

--

-- Name: DEFAULT PRIVILEGES FOR SEQUENCES; Type: DEFAULT ACL; Schema: public; Owner: gitlab_dbo

--

ALTER DEFAULT PRIVILEGES FOR ROLE <dbowner> IN SCHEMA public REVOKE ALL ON SEQUENCES  FROM <dbowner>;

ALTER DEFAULT PRIVILEGES FOR ROLE <dbowner> IN SCHEMA public GRANT SELECT,USAGE ON SEQUENCES  TO <appuser>;

--

-- Name: DEFAULT PRIVILEGES FOR TABLES; Type: DEFAULT ACL; Schema: public; Owner: <dbowner>

--

ALTER DEFAULT PRIVILEGES FOR ROLE <dbowner> IN SCHEMA public REVOKE ALL ON TABLES  FROM <dbowner>;

ALTER DEFAULT PRIVILEGES FOR ROLE <dbowner> IN SCHEMA public GRANT SELECT,INSERT,DELETE,UPDATE ON TABLES  TO <appuser>;

Why would you want to revoke all privileges from the dbowner?

It actually had granted the privileges to PUBLIC, but I revoked those privileges & changed it to the app account.

What is the difference between these statements?:

ALTER DEFAULT PRIVILEGES FOR ROLE <dbowner> IN SCHEMA public GRANT ...  TO <appuser>;

ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT ... TO <appuser>;