Currently you can query for generic data and an abuse email address but the contact details are only revealed if you are the domain holder or have a solid reason[1].
> In all other cases, DENIC will generally not provide information. Instead, if you think that the contents of a website that can be accessed via a domain may be illegal, you should send an e-mail reporting the matter to the e-mail address for abuse reports (Abuse). You find the e-mail address on the domain query page. Moreover, the imprint, if any, of the website concerned will inform you who is the operator of the website.
To add some additional context, a proper, up-to-date imprint, including a postal address (no P.O.) and in most cases a phone number, is legally required for practically every website in Germany
[1] https://www.denic.de/en/service/whois-service/third-party-re...
Anyway, if you have any questions regarding domain registration in Germany or which registrars worked well for me, feel free to contact me, my details are in my profile.
I was showing a non-technical colleague only two weeks ago how doing a whois query on our company's .co.uk domain showed our company address and the individual responsible for registration. I just checked again now and pretty much all the useful info has gone.
See http://www.ownit.nyc/faq, under "WILL PROXY REGISTRATIONS, SOMETIMES CALLED “DOMAIN PRIVACY” BE ALLOWED ON MY .NYC DOMAIN NAME?"
Basically, it's the registrar's policy to prohibit obfuscating the actual domain owner. Resellers like Namecheap have to abide by these policies.
I can't speak for EU domains, or for the reasoning behind the .NYC policy.
The same restriction also applies to other name registrars like Gandi: https://wiki.gandi.net/en/domains/private-registration
I can't recall the .vote/.voto policies (haven't work for a registrar in a year), nor those for .asia.
Most of those listed TLDs likely have requirements about who can register domains on that TLD, so they need that info for verification purposes. That doesn't mean that they're publishing it in WHOIS though; many are not.