In the European Union, EU directive 2000/31/EC makes it a legal requirement that contact information and address are provided on any website which offers "information society services". Member states have to put appropriate national legislation in place, e.g. in Germany the "Telemediengesetz" (TMG).
That strange term "information society services" is defined broadly and includes e.g. online shops, online product catalogs, and other information offerings which serve a commercial purpose (and are typically, but not necessarily, offered for a charge). So there should not be much debate whether a EU-based commercial website makes the company's address available.
Interesting.
I understand its aim for e-commerce. It's interesting that article 5 of that directive also cites that just email is sufficient for rapid communications. There is no mention of phone.
Either big corporations are escaping this ruling for 2+ decades, or it doesn't apply to them. Google, Facebook, etc. are not e-commerce in its core activity. They may be commercial entities, but customers typically do not spend money on them. Although Play and Oculus App store begs to differ. So now I'm also a bit confused.
But regarding e.g. a freelancer or private consultant, I'm not sure how these rules apply. Safest bet is to include information, but then I could also devil's advocate based on 2 arguments:
1) If nobody cares about it, you probably get away skipping it 'for now'. It becomes an issue when its urgent (TM).
2) One could argue that a freelancer or consultancy homepage does not include a commercial transaction, but is just a digital visitor card for someones services. Many sites that offer information providing and commercialize based on ad revenue is perhaps similar. If you cannot spend money on a site, it can still mean the site has a commercial intent, however to what extent does need to follow this ruling.
I know it does play very well in the data-driven society where the internet of a gold mine for advertisers with restrictive EULAs that you "agree upon" by "using" a website, without any repercussions.
As long as handing over data is not seen as a commercial transaction, this remains a problem.
That directive does state its main target is "in particular" e-commerce, so I think its open for interpretation and argument which commercial activities are particularly bound to its internet presence. Maybe a jurist/lawyer/judge case will have to attempt to clarify the intent and practical implications of such a law, since a freelancer working from home maybe only wants to be contacted by email, (mobile) phone and P.O. box. And honestly I think that's a legit claim. However since I'm neither of those (jurist/lawyer/judge), don't take my 0.02EUR for any legal advice[/disclaimer].