Aren’t you able to see this in your Google account settings? I could have sworn I’ve seen a list of all the sites where I used “Sign in with Google”.

Ah the ole “Streisand effect”.

I’m using Mullvad at the moment as well and looking to change for the same reason. I’ve been looking at switching to AirVPN once all my credit runs out on Mullvad. They have a similar model to Mullvad, but they allow port forwarding.