Not a mention of "opt-in only, because we respect privacy"... Please stop helping spy on users! Be the change you want to see in the world!
That's because this tool has nothing to do with "spying on users". It's a set of tools and a specification for instrumenting applications and collecting logs/metrics/traces from them. It's used to ask questions like "why is this page slow to load?" and get answers like "because it talks to the billing microservice which has a really slow SQL query". This isn't the same sort of telemetry that desktop software vendors…
"the browser"
That means they are running code on my machine and exfiltrating data out.