Because otherwise people from the biggest countries dominate the system simply due to their high population numbers, and then distort the host society and its immigration system to suit their needs. Immigration knowledge becomes monopolised.
To put it simply - Indians, when they have established themselves, hire more Indian migrants, at the expense of others. Lookup Infosys discrimination in the USA, this is established fact.
To put it simply - Indians, when they have established themselves, hire more Indian migrants, at the expense of others. Lookup Infosys discrimination in the USA, this is established fact.