I'm all for this functionality but if the said users go to Chrome because "Firefox has no privacy" this is ridiculous. Firefox is our best browser in this domain, let's not kill it by complaining indefinitely on it.
What are you going to switch to? Chrome? Sure, it would be nice to have an easy switch that disables all telemetry, but let's not forget that every other major browsers collects far more data, and the most popular browser steers you toward to storing your entire web and location history on their servers as soon as you log into your email account. Kinda puts non-identifying information about Firefox's performance into perspective, doesn't it?