What I really really want is to have distros push for a centralized place for telemetry opt-out - something like /etc/telemetry.conf or ~/.config/telemetry.conf

What I really really want is to have distros push for a centralized place for telemetry opt-out - something like /etc/telemetry.conf or ~/.config/telemetry.conf - and force all applications to either make telemetry opt-in or honor this config (perhaps patching the applications and submitting the patches upstream)