I’ve just learned: you don’t. I thought this was limited to just GeForce experience, but it’s not.

You need to kill Nvidia telemetry services (one site has it listed as nmtvmon).

Another option would be to block traffic to Nvidia from leaving your network (pihole captures at least some Nvidia telemetry, not sure if it blocks all). I don’t have a list of urls or IPs to look out for.