In this world, most sandbox games are done by overseas developers. Take Earth Online for example, allowing players to work, buy cards and houses, and experience different careers in game. This was one of the games that provided players with a high degree of freedom.
However, it wasn't truly a sandbox game.
Sandbox games had two main features, rich content, and allowing players to create freely. Although Earth Online was a content rich game, the game still operated under the restrictions of the designer as they weren't allowed to make much if at all.
It should be emphasised that the ability to create is a core factor in sandbox games, meaning the players could create whatever they want through resources provided by the game.
Games that didn't fulfil this aspect couldn't be considered a true sandbox game.