⭐ Firewall allows you to block apps from accessing the Internet without root requirement.
⭕ Firewall uses the Android VpnService to route traffic to itself, the apps access the Internet will be filtered on-device instead of on a server.
⭕ The reason VpnService is needed:
  - Users can allow/block the apps access the Internet, the technical for this solution is using VpnService for control the Internet access
  - Firewall uses the Android VpnService to block the Internet access for apps on device
  - Internet access will be filtered or block on-device instead of on a server
  - We do not use VpnService to route traffic to any server, VpnService just only locally on-device to block app from access the Internet
🔶 Firewall can block app from accessing to the internet.
🔶 Applications can be allowed or denied access to your Wi-Fi and/or mobile connection.
🔶 Blocking access to the internet can help protect for your Android.
🔶 With Internet access control, you can block any network access based app, block internet per app