Apple promotes privacy (which is great), but at the same time they behave like a dictatorship by not providing an opt-out of the iOS walled garden, which they do provide with System Integrity Protection on macOS.

What he is doing will not prevent apps from extracting information and uploading it to their servers. For example, by using an ip address instead of a hostname/domain, an app/service can exclude themselves from the "domain graph" he created with this vpn. Sure you could eventually track down the public ips an app communicates with and block those, but the app will always keep collecting and storing your data, and at some point in time they update their app and change the ip - by the time you notice this your data is already uploaded to the new ip.

The only proper solution is an app firewall for iOS, which is not allowed by Apple. Apple is crippling our freedom with their walled garden/dictatorship, which makes me sad.