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This is clearly not for crash reporting. They're sucking up libs to figure out what apps their users use.

Could be a few reasons, could be boring metrics, could be anticompetitive identification of acquisition targets, could be oppo research, could be user profiling.

None of these things I'm ok with Facebook getting off my phone.

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It sounds like you don't understand what the term "system libraries" means. It's impossible to tell what apps people are using by uploading system libraries. You could probably tell what type of phone they are using by doing it, but that would be dumb since Android already tells you what kind of phone it is.

> They're sucking up libs to figure out what apps their users use.

Hypothesis 1, debugging: requires full copies of system libraries

Hypothesis 2, fingerprinting: requires hashes of application libraries

Evidence: full copies of system libraries are being uploaded

How are you using that evidence to be so confident in hypothesis 2 and confidently against hypothesis 1?

Hypothesis 3: they do both

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