EU publishers already had to have the cookie warning..the EU said they had to a long time ago..( became mandatory in 2012* for all EU based websites, not just EU websites which had / have adsense ) we even talked about it here, at the time..
Search for "EU requires cookie warning on sites" to read about how it was introduced..
Google didn't care if EU publishers obeyed EU law before ( Google itself was in trouble with the EU over other things, but thought that they could get out of it ) ..Now, since the person dealing with Google at the EU has changed, and she has said that Google must comply with EU competition, law, and the EU has also said that they do not like how Google is scraping images etc ) Google are trying to mount a PR campaign with the EU authorities in the hope that the EU will "back off" a little..
Not all EU websites ( whether or not they use adsense ) did / do show a cookie warning since 2012..
The EU has not done much about them..some have been prosecuted, but not many..Most EU websites did put a cookie warning in place in 2012..
Google will no doubt apply the same sanctions to EU websites that don't have the cookie warning, as they will to non EU based sites that do not after end of September 2015..
Some EU based websites may not have been individually contacted by Google about this either, not all the website owners in the EU, or any other country post or red WebmasterWorld..how many EU websites ( and especially EU fora ) do you read, that are not in English..?
So how would you know if all EU publishers got notified individually by Google..I don't know..and I'm in the EU, and I read non English language EU websites, but I don't read very single one..;)
Plus..There are far fewer people posting on WebmasterWorld nowadays than there used to be, from all countries, I notice far fewer posting from the EU or outside of the U.S.A than there used to be..and fewer from inside the U.S.A, we, those who are posting here are no longer a large enough sample of the webmasters of any country to be taken as being representative of anything, certainly not of "who got notified individually by Google" of "anything"..
What makes you think that Google have told all EU websites individually about this..Logically Google would not need to contact any off us in the EU, they could simply say that we would already know via EU law about cookie consent / notification.. ..which as businesses in the EU we are already required to know and comply with..:)
As far as I'm aware any one in the EU that runs a website that makes money from any source, be it adsense or other ads( direct or 3rd party ) or selling products or services..Has to have ( by the laws of the country they are living in or based in fiscally ) a business registration of some sort..They cannot just declare their income at the end of the year as a private individual, because in any EU country, we are all required to pay not only taxes on income, but also a percentage of that income as mandatory or obligatory "social security, health care, and retirement/ pension contributions" ..That means that all EU adsense publishers ( unless working as illegal undeclared businesses ) are expected to comply with all national and EU laws that apply to their type of business in their respective countries..
In a similar example..in France..if you sell on Ebay ..and you sell over 20 times per month( whatever the total value of those sales, whatever the items are, new or used, doesn't matter.. Ebay France are required to notify the central French social security services..URSSAF..of your name, address, and the amounts of money you have made..The URSSAF will then insist that you pay a percentage of that money to them as "contributions",,and they will tell the French equivalent of the IRS about you, who will the expect you to declare it at the end of the fiscal year..
So...No working without paying contributions or taxes via the web here..here it is called working "black"..or "au noir"..
Google are also required by EU ( and in my case French law ) to notify the tax and social security organisations of the country that the EU publisher is resident in of any and all monies paid out by Google via adsense..
Might take the authorities a while to get around to knocking on your door, or in some cases just blocking your bank accounts ( which they do not need a court order to do in France ) but eventually they do get around to everyone..
I know ..because I have helped out some members here ( and other people not members here ) when the French authorities have "caught up with them"..and I "consult" for a couple of branches of the French "authorities" occasionally..
ps..@Badger37..thanks for the info :)