A few ways you could verify it's off: 1. Try using the Privacy Sandbox APIs on your own site to confirm they don't work. 2. Examine your Chrome profile to mak

A few ways you could verify it's off: 1. Try using the Privacy Sandbox APIs on your own site to confirm they don't work. 2. Examine your Chrome profile to make sure it doesn't contain ad topics or ad measurement data. 3. Sniff network traffic to ensure Chrome is not sending anything sensitive to Google (using SSLKEYLOGFILE so you can decrypt HTTPS connections). EFF's article ought to be clearer that all of the privacy sandbox logic happens on your own device rather than Google servers.