I've a colleague who's pursuing her PhD in anthropology and religious studies in a German public university, having one of her advisor there and another advisor from another public university in Austria. She told me that:
i) she needs no publications to get a PhD thesis, unlike science or engineering, and
ii) she needs to pay a publisher to publish her PhD thesis, as per the rules of her program or the university.
While I understand that regarding i), the requirement to publish articles may depend on the disciplines, but ii) strikes me as very odd, especially when she told me that it costs at least a few thousand Euros to publish a PhD thesis. Now, as a total outsider to the university, her program or her discipline, I've no clue why one has to pay to publish her thesis, but as a long time academic, I find this very odd and I'd appreciate it if someone familiar with the system can shed some light on the matter, and also let me know if ii) remains the same for other countries, in or outside Europe.
Addendum: When I wrote my PhD thesis in math about ten years ago in a public university in the US, I didn't have to publish my thesis as a book. I published papers in journals and didn't have to pay a dime for the same.