Luckily, the unlimited/”all-you-can-eat” culture was not part of the Internet landscape in Asia. Even in its birthplace, it has been in decline, except in the imaginations of the passionate and uninformed. Here is a piece that illustrates the retreat from unlimited.
T-Mobile also practices what is called network deprioritization. In areas where networks are congested, T-Mobile will look for the highest data consumers — those who have surpassed 21 gigabytes of data — and give priority in providing higher speeds to those who have consumed less data. Even if that situation is uncommon, it is a limitation on an unlimited data plan nonetheless.