All so that judges from different countries look at the game in the same way.
World Rugby is seriously considering signing contracts with the best referees on the planet directly. Referees are now paid by their rugby unions.
The main idea of such a move is the same interpretation of the rules of the game in big tournaments like the World Cup, the Six Nations Cup and the Rugby Championship.
It is assumed that the initiative will be implemented from 2024, and contracts will be signed for cycles between the World Cups. Moreover, it is assumed that such referees, in addition to continuing to work in domestic championships, will also supervise clubs, as well as beginner referees, and from different rugby unions. According to World Rugby, this will help to come to the same understanding of the rules of the game in all countries.
Source: rugger.info