I don't think it's possible to cite evidence for something that hasn't happened yet. The expectation is based in part on many years of observing the overseas Chinese communities and Chinese projects in Southeast Asia, in part on many years of observing large development projects (even those with the best of intentions) and in part on the basic nature of human and international relations. Surely nobody believes that the Chinese don't intend to take more out than they put in...
Chinese interaction with Africa didn't start yesterday. The Tanzam railway is an example, the Chinese are re-evaluating the railway with a view to upgrading it and making it run profitable.

Ask any Tanzanian about the legacy of the Tanzam railway.

Secondly, the West has a much worse legacy of abandoned projects than the Chinese. The entire landscape of Africa is littered with abandoned "World Bank Assisted" projects.

The Chinese on the other hand, have a much better record of revisiting their abandoned projects like rice projects in Sierra Leone, the Tanzam railway and cotton projects in Mali.

The Chinese experience in Africa is not a mirror image of the South East Asian experience.

We understand that Westerners don't like the Chinese and I still maintain that a lot of Western commentary on Chinese activities in Africa is less informed by facts but a visceral dislike of the Chinese.