Eurogamer is reporting that the United Kingdom's Advertising Standards Authority is investigating No Man's Sky with regard to allegations of false advertising that are "in breach of its code of conduct" based on the NMS Steam store page. According to complaints, the assets on the page ostensibly misrepresent the game on release.
According to Reddit user AzzerUK:
Today, I received a response from the ASA (Advertising Standards Agency in the UK), with regards to the trailers, screenshots, and general information on the Steam store page of No Man's Sky, with regards to them being misleading and mis-representing the actual game.
I can't speak about other countries, but in the UK that are regulations about providing advertising material that could mislead a consumer in some way - eg displaying things that do not, in fact, exist. The ASA say they have received a number of complaints, and so the points below are not necessarily all related to things I personally took issue with, but are the issues they have picked out at the most clear-cut problems from amongst all complaints.
In the ASA response, they say that both Hello Games and Valve have a joint responsibility, and so both organisations have now been contacted by the ASA and have been told to respond to the following issues which the ASA picked out as the primary issues (compiled from a number of complainants that contacted the ASA).
Check out a long list of proof of the allegations on the No Man's Sky Reddit.
Eurogamer has reached out to Hello Games, though has yet to receive a response. We'll keep you posted.