If telemetry is on by default, the vendor obviously wants you to have telemetry on. They are incentivized to make switching it off as difficult as possible, and

If telemetry is on by default, the vendor obviously wants you to have telemetry on. They are incentivized to make switching it off as difficult as possible, and even pull tricks like turning it back on after a delay of 7 or 30 days or so. Telemetry should be opt-in, if it's provided at all.