There's actually a pretty good book about that: https://www.amazon.com/gp/product/B085YDW8TX/ref=ppx_yo_dt_b_search_asin_title
You have to remember, China is different than the western world. Fundamentally they do not care about money. At their core they care about controlling their population. They use their wealth to give everyone jobs so no one cares to protest the CCP. The problem is they are the most over-leveraged economy ever and being an "export economy" is dying a final death this year with the collapse of demographics.
And while the B&R Initiative sounds good, its mostly dumping a ton of money into places that they'll never see a real ROI in. There's a reason no one did it before. Add in the fact that China can't project power to Africa and they might as well be throwing that money into the trash.
It doesn't need to go on forever. As the situation evolves, fiscal and regulatory policy evolve to try and compensate. I recommend China: The Bubble That Never Pops as a well-written, reasonably balanced overview of how this process has gone on over the past several decades (silly title notwithstanding).