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But what does it have to do with the players not being able to enter on Horus?

In theory, this prevents the huge shit storms there would be if NGD gave the Spanish users access to Horus on their normal accounts. In this way, NGD encourages their partner to continue sustaining the game by sending them already milked players to their server while also keeping Horus cleaned from too many Spanish speakers which was the reason why NGD made Horus in the first place.