If you post that data on a public domain, that is publicly available. It's like writing that info on a cardboard and putting it in the town square and then saying 'why you people steal my data!'
Another danger is when public but not easily accessible data is able to deanonymize datasets which is probably the norm rather than the exception for anonymized datasets. Sure there are technical measures to make it better, but at the end of the day I think a lot of privacy is about respecting social boundaries and not breaking these protection measures even if technically possible. Most of the time, these measures are really about keeping honest people honest and not about stopping dedicated attackers.