Whilst shocking this is really no surprise. When loopholes exist in an inefficient system there will always be some ready to exploit them. All this does is demonstrate how badly we are handling visa applications.
Not just in accepting fraudulent applications of this type, but refusing perfectly legitimate ones. I know someone whose wife, who acquired British citizenship many years ago, sponsored her sister to visit her. She was paying all the costs, and providing the flight tickets back and forth. No cost to us at all, in fact a gain to our economy. A simple UK visitor visa was applied for, substantial fees paid, documentation produced and biometrics taken. It was refused on the basis they weren’t satisfied her sister wouldn’t overstay. She has her own family to return to and an offer was made to deposit a security guarantee. An appeal isn’t available and she was warned another application would also be refused.
My understanding is, which others here may have better information on than me, that many of the applications these days are actually made by algorithms flagging up red lines, with little human involvement.
If true, with the reported statistics of the level of asylum claims that succeed because of potential mistreatment in the home countries coming hugely disproportionately from a small number of sources, this ought to be easy to identify and stop. No matter how elaborate the deception.