It does not matter where you are. Extended ads is an option to the advertiser just like all the advertiser options are available to the advertiser.
If you go to an ice cream shop and you can buy a spoon full of ice cream for one cent or a big cup of ice cream for two cents, it depends on how much money is in your pocket and how hungry you are as to which one you will buy. It does not matter if you are in India, Indonesia, USA, UK, or where you are...you are either real hungry and have money or you are not so hungry and not much money.
It is dependent upon what the advertiser purchases. That is all. Very simple. As we all know, we don't see as many extended ads no matter what country we are in because most everyone is on a budget these days and the advertiser may not be as hungry as he should be.