Personally I never use cash anymore, because cards are just more convenient. That being said, I agree with the conspiracy nuts that cash should always stay a viable alternative. I trust the current government and banks enough, but if all goes to shit I want to be able to pay with cash to keep my data safe.
A VPN doesn’t really protect you from Google though. They get their data through trackers, which doesn’t get blocked by a VPN. Obviously I’d still not use a Google VPN, because who knows what they’d do with that data