The assumption by framing that telemetry programs are “often” anything notably weakens your argument. A collection of examples of different entities misusing telemetry over time would strengthen your argument.
I don't need to provide evidence of misuse. The terms of the telemetry programs of the most popular mobile apps and modern destkop apps are far too broad. Just like I don't allow my government more power than it needs, not waiting around for proof of misusing unlimited power, I don't need to wait for a dozen major scandals related to telemetry. But certainly, there are dozens upon dozens of cases of people getting damaged by data leaks from other companies (see Equifax), which is a directly related problem.
The overreaching abuse of telemetry and ToS is a known thing, it's public consensus among those who actually read these things, and so the onus of proof is on you to prove otherwise, not me.
Otherwise I would have to provide a collection of different examples every time I explain to someone that an object in motion remains in motion until acted upon by an outside force. At some point, you have to accept consensus as fact unless you can prove otherwise.
