Have a Raspberry Pi in one of my drawers. Found a new job: blocking web advertisement over a VPN. Just install Pi-Hole and PIVPN (openvpn) on the Raspberry. Now I run for free a VPN that blocks all these annoying ads and trackers. There are lots of howto's available for installing. Here is an example.
On the pic below you see on the right mobile phone connection to the VPN, the log of the VPN server and left Pi Hole data.
On the pic below you see on the right mobile phone connection to the VPN, the log of the VPN server and left Pi Hole data.