Granted, the system may be difficult for foreigners to navigate but the basic information is there. Thats why I answer specific questions where there is evidence the available stuff has been already sought.
"Do your background research before you starting a PhD"
This totally oversimplifies the issue. Whereas there are fields where people are actively told there is not enough work, I was told there would be work (from several sources), was given funding. How could I predict my supervisor would turn out to be a political schemer that dragged me down? You tell me?
Btw, see my other post about universities taking on students without adequate backgrounds.