You can... 1. Make telemetry opt-in and ask the user to share data. This is what Apple does 2. Collect telemetry and give the user an option to share that

You can... 1. Make telemetry opt-in and ask the user to share data. This is what Apple does 2. Collect telemetry and give the user an option to share that data after a crash or bug. Many companies do this. 3. Make telemetry opt-out but be forthright with what information is sent and why. 4. Don't allow opting out of telemetry but be open and upfront with what is being collected and why. 5. Hide the fact that telemetry is being sent, hide what is being sent, and don't allow the user to opt out.