China doesn’t give money to countries to build these projects. The money is given directly to Chinese State Owned Enterprises to build the projects. That can be a great way to keep costs low, but it also means there is no transfer of knowledge for building these of projects to locals.
Chinese deals are for a very long time, with some going for 100 years. China may also write the deals to trade for commodities instead of money, so there is risk that the commodity price goes up and China makes money on the deal.
Also, China makes a lot of these deals for China’s best interests. It could align with the host country’s interests, but not always. Of course, it isn’t like Western countries don’t do the same, but it is something to look out for.
I can see why countries would choose China as a partner to finance and build infrastructure, but it is important to know the fine print of the deal, or in this case, several deals.