Open VPN sadly doesn't for me. I was trying to use some add-ons like this ( https://techvpn.com/best-kodi-addons/) and when connected, the add-ons never work. It only works when the VPN is not running. Even with other premium VPNs, it doesn't work.

Yeah, I'm an evil person. 😄 My provider uses Dual Stack Lite, so I only got a IPv6 address to reach my network. But i.e. my mobile provider only supports IPv4. So I wanted to use the rpi3, because it doesn't consume that much power and it can run 24/7, as a VPN-bridge to my network together with an IPv4->IPv6 mapping service.