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.
> I don't think MS let their customers make an informed choice about their data collection.
I think this is part of a larger problem where no single individual can given informed consent to any corporate contract because one involves a team of lawyers and the other involves an average person. Even if the single individual was a lawyer it would be questionable, but for the average person who has a limited college education and no special legal education at all, there is far too great a power difference for informed consent to be given.
I don't know, but I assume the telemetry is used for marketing by Microsoft at least and probably by their partners (ie people who financially benefit Microsoft partially in return for access to "telemetry").
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.