It is not only about the competition between the stars within the squad itself, it is also that Haaland wants to write history and you can't really do that in France. Was it an era when PSG wins the title 20 times in a row? Not really. Would it be an era when Chelsea wins the title 5 times in a row in England? Definitely yes. Ligue 1 is just not attractive and competitive enough. It's crazy to think about the fact that Messi and Neymar are playing in France. They do it for the money, but not because they want to write history.
Haaland, of course, wants to write history, but the most important thing is that it should be backed up by a very large reward 
The main problem of Paris Saint-Germain in the eyes of many top players is the not so high status of the French Championship itself and therefore it has to be supported by a solid salary supplement. On the other hand, the presence of other star players of the level of Neymar, Messi and others partially brightens up this situation and raises the status of the club itself for other applicants. Also, do not forget that PSG does not yet have the title of the winner of the Champions League, unlike Real Madrid, for which the title of the winner will not be the first. Therefore, where else but in Paris to write history, if the conversation turned to writing history 