The opt-out does not exist for Home and Pro users. Only Windows 10 Enterprise can completely disable the telemetry engine. Unless you take extra steps (firewall rules, network-level blocking, etc.) Microsoft will get a ping every time a new device is plugged in and there's no way to disable that for the common user.
I used to accept most telemetry popups from Microsoft before they became opt-out, but in the scheme MS has currently set up, I don't think MS let their customers make an informed choice about their data collection. For that reason, I oppose it as much as I can.
