A runtime option for disabling telemetry has little value for build tools because any random build script can re-enable it without you knowing. Even more so if

A runtime option for disabling telemetry has little value for build tools because any random build script can re-enable it without you knowing. Even more so if it's an environment variable for opting out, because it's so common for build scripts to clear environment variables for legitimate reasons. Whether there's a compile time option to disable telemetry altogether is what many downstream packagers would probably be interested in.