Tristan (Australia)

This is basically about money. Not the greater social good. As a result, universities just want as many high fee paying students as possible and don't mind if standards are lax. From my experience at University in Australia, I'd say nearly three quarters of Chinese international students lacked the English skills to study a degree in English. If you raise the standards, then less enrolments and less money.

Many of them also really only wanted to be overseas so they could stand out back home. Naturally they then group together. My point is that this basically boils down to a few things. First, it's too easy to study abroad without sufficient English skills because universities will seek to maximize profits. Second, humans tend to hang around in groups they feel comfortable with and imagine their own culture is best without experiencing something different.