Just had a thought.  A no. of ISPs now offer unlimited these days.  Back in the day some may saw it as unsustainable Telecom provided unlimited but it fell over and the talk that some othe countries that the USA might be withdrawing unlimited internet too, one telco in Hong Kong also withdrew  unlimited off their mobile internet plans. 

Now looking back was it simply Telecom not allocating enough costs to it and wanting more revenue or has the situation significantly change now?