Using the terms “telemetry” and “spyware” interchangeably makes the former seem more nefarious and the latter less nefarious. I understand where you’re coming from but I wouldn’t want to see the term “spyware” diluted to include anonymised data about how users are using product features.
That’s not to say telemetry data is fine or that a company might claim to only use telemetry data isn’t actually using spyware.