The trusted domains are just empty, so you don’t expose your hostname?
Same thing for the overwrite.cli.url, it should not be empty, it’s something like https://cloud.example.com or https://cloud.example.com/nextcloud, this URL is then used to generate the sharing links (it’s used especially when you pass through proxies or have different trusted domains, so you are sure that the sharing links are ok. If it is not defined, Nextcloud tries to figure it out by itself). You must not set this value empty.