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Re:Estonia plans to become a free public transport nation by jnsaff2 on Saturday May 19, 2018 @01:31PM (#17108815)
See my comment [0] for the reason why tracking is necessary for them.

[0] https://news.ycombinator.com/item?id=17108804

Re:Estonia plans to become a free public transport nation by jacquesm on Saturday May 19, 2018 @03:37PM (#17109369)
Thank you for that explanation, it makes perfect sense now.