The whole point of such investments is to be siphoned. You can't directly pay a bribe (do it enough and at a large enough size and you open yourself to FCPA violations which block access to Western markets by making you toxic and piercing the corporate veil) but you can always loop contracting companies owned by the political elite of your country.

This is why Chinese construction consortiums in Sri Lanka built infrastructure in Rajapraksa's home district and why a Chinese consortium bought a 49% stake in Hondutel - Honduras's primary mobile provider, which is owned by the family of the husband (and former President) of the current President of Honduras.

American companies used to do this as well (eg. According to a close relative, DEC's India operation would always use MSPs affiliated with senior Indian Air Force officials to land deals. When the US cracked down on such tactics with the amended FCPA in 1998, those contracts went to Israeli companies instead even after the Kargil sanctions were lifted).