In the EU. And it put the insanity of having many incompatible chargers to an end up to the point when some mobile phone producers did not include a charger with the phone they sold because they rightly assumed one available from the previous phone.
One really good EU standardization effort which actually worked except for Apple.
There were an exception clause specifically for the likes of Apple. As long as the proprietary plug was removable from the charger (either by having the other end plug into an A socket on the charger, or by being a proprietary-to-micro converter) the EU would accept it.
The main point was to facilitate that chargers could be reused, rather than fill up drawers and landfills.
One really good EU standardization effort which actually worked except for Apple.