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I got one idea and I would like to read yours too.
1. Host legal power-leveling service. The game company in question would hire cheap workforce from China and then work a middleman between them and their costumers. To compete with regular power-leveling services, they would be able to garantuee that the costumers do not risk losing their account neither to ban nor to the power-levelers. It is a definitely a win-win situation for Westerners who don't always have time to level their characters by themselves and for the Chinese workforce.