There's no issue with opt-in telemetry, where the user says "yes, it's okay to track me".
Invisible, silent, always-on telemetry is actually just spyware that's been mislabeled.
Ultimately it's not the telemetry that's at issue: it's the unethical and selfish behavior of the software/device manufacturer.
No sane or reasonable person thinks that an EULA is informed consent.