As in, is there a particular type of data, or information about your app usage that you don't want developers having access to?

I worked at a trading company before, and one of the reasons we pushed out telemetry was due to user's feature requests - users would request features, and we wanted to see if they were actually using them, so that we could prioritise developer time accordingly.

That is a concrete example of how this data is useful.

I am curious about any concrete examples from the other side.