The problem with opt-in telemetry is that 95% of users are sick and tired of being spied on with every little thing they do.

Telemetry (if it’s truly telemetry) is nowhere close to “tracking”. People conflate the two all the time. One can provide useful, anonymous metrics (e.g. “user enabled feature X”) without doing anything but incrementing the counter for “feature X”.

The “Firefox Problem” is that all the power users disable telemetry, so all the “cool” features that power users like (but never get used by “regular people”) get ignored or removed instead of improved because, according to the metrics, “nobody uses them”.

If they really were they would turn it off. And stop using Gmail and Android.

The overwhelming majority of people don't care about digital privacy because the cost is opaque to them.

Also, telemetry when done right isn't "spying". Again, it is anonymized and used to see, for example, where the hot paths and paper cuts in applications are.

As you can see with TikTok / Instagram usage…regular people who are not on HN could not care less about that.