Some of these countries have up to 20% of their GDP as debt to Communist China, and when they cannot repay the loans, the Communists do what any loan shark would do in that situation, and it has already paid off handsomely for them.
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That was/is there plan. But the Chinese have been so heavy handed in their dealings with other nations there are few that want their help and the few that have got entangled are looking for ways out.
The reason China even began the BRI is because they are surrounded by potential enemies that could easily blockade all China shipping. Japan, India, Taiwan, Philippine, Malaysia and Australia are forming partnerships with each. The goal is to weaken China and if need be become allies in any war with China.
There are a lot of cultural things I dislike about China, but stupidity and being able to play the long game are not among them.