What I've never understood is, how is this an issue with private repos? Aside from open source projects I can't see the problem with accidentally doing this, even though it is a smell.
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Example, there's an ICE reporting app now where people can anonymously report ICE sightings... but how anonymous is it really? Users report a location, that can be cross-referenced with location histories and quicky led back to an individual. There may be retaliation to users of this app if the spiral into authoritarianism in the US continues.
For now they're going to be making a lot of basic mistakes but eventually they'll grugq up and learn from people that are already used to dealing with the violence of their government.