You didn't explain why, in your opinion, opt-out is disrespectful; why respect requires opt-in. For most Western users, the bandwidth is hardly a drop in the bucket, and while there are certainly kinds of telemetry that are disrespectful of a user's privacy, telemetry in and of itself is not (in my opinion) abusive of user privacy, and therefore neither is opt-out abusive.
Indeed, if you were to argue that telemetry violates user privacy, then opt-in (i.e. to help send bug reports) doesn't fix that. If you add a "send bug report" button, but the data collected in the bug report abuses the user's privacy, why is it ethically any better? The data collected is far more important than the frequency or control over how and when it's sent. Users who desire taking that control should anyway run their own restrictive, allowlist-based firewall, which no opt-in/opt-out setting can overcome anyway.