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Mozilla is already revising its new Firefox terms to clarify how it handles user data
(www.theverge.com)
This is a most excellent place for technology news and articles.
While they have to be careful, there can be reasonable ones to help what they do/stop doing.
Example, "x% of telemetry enabled users enable the bookmark bar", not particularly useful for harmful purposes, but if it were 0.00%, then they know efforts accommodating the bookmark bar would be pointless. Not many users would go out of their way to say "I don't use some feature I'm ignoring", and telemetry is able to convey that data, so the developer is not guessing based on his preference.
That being said, the telemetry is so opaque that it's hard to make an informed decision as to whether the telemetry in question is risky or not. Might be good to have some sort of accumulated telemetry data that you can click to review and submit, and have that data be actually human readable and to the point for salient points.