This is also true for almost all of devices which could connect to internet. We need a portable small router with firewall feature which could physically ban th

This is also true for almost all of devices which could connect to internet. We need a portable small router with firewall feature which could physically ban the specific IPs or domains. For example, iOS to Apple, mac to Apple, Win10 to MS, etc. These connections are much difficult to ban nowadays. What we could do might be limiting their upstream connection via physical firewall router with built-in good web-based GUI.