Good feedback! Clarity around this is the 2nd sentence of the readme, now. Thank you for catching this

Split Tunnel IPv6 Wireguard VPN for DNS based ad blocking, running on Ubuntu 20.04 Minimal server with Pi-Hole 5.

Author of that guide chiming in! None; Google Cloud Services is not a consumer offering. The monetization approach is different from the model wherein you give up privacy in exchange for a service. More info at: https://cloud.google.com/security/

Split Tunnel use dings just kilobytes a day and is sufficient for ad blocking purposes. Using the Standard Tier network instead of Premium could be better for heavy data use.