Flickr, now owned by Yahoo, instituted blanket filters to objectionable material for all users a few months ago... you have to set your "safesearch" preference, and as I recall lifting the filter was not intuitive.
I was surprised, but looked it up... the options for safesearch setting "does not apply if your Yahoo! ID is based in Singapore, Germany, Hong Kong or Korea"
This must be in reaction to GERMAN law, however. Yahoo would not single out Germany without reason, while leaving France and Austria unfiltered. I looked that up:
"The Ministry for Families, Seniors, Women and Children (Bundesministerium fur Familie, Senioren, Frauen und Jugend) continues to issue takedown notices to foreign web hosts under the "Act of the Dissemination of Publications and other Media Morally Harmful to Youth" in relation to offshore sites that contain material "harmful to youth" including online pornography that would be rated X or RC"
http://www.efa.org.au/Issues/Censor/cens3.html#gerIt seems your ire is misplaced. You should probably write Bundesministerium fur Familie, Senioren, Frauen und Jugend.
Why don't you get a yahoo ID based out of another country?