Assuming Haaland left Manchester City, his great destination would have been Real Madrid. PSG is a team with too many controversies. The big stars also gradually left PSG.
Coming to Ligue 1, there was little competition, and PSG was destined to become king. Please look back at the careers of Neymar and Mbappé when they arrived at PSG. It decreases over time. Suppose Mbappé continues to bury his youth with the PSG club. Then, his career will decline. PSG has nothing but abundant financial resources. Let's see if PSG are making any players stand out or ruining their careers.
It is very true that Realmadrid would had been a very good destination for Haaland if he decides to leave Manchester City but theirs still a possibility that he would had as well ended up at PSG given that they're very financially capable of getting him into their team, we've seen in recent times that clubs that are financially strong easily attracts top players into their Club, PSG is not a small club and would offer him the opportunity in the Champions League as Realmadrid would also, moreover before the likes of Neymar and Messi moved over there they're several other top stars like Ibrahimovic and Cavani that's succeeded in the club, I feel Messi and Neymar didn't leave up to expectations that's they had to leave and more Neymar's was due to his numerous injuries, I don't see PSG as a club that ruin players career, because over there a player is sure of winning the league trophy and standing out is based on a players individual performance and not the club's fault.
Haaland will not go to PSG, City already pays him a lot of money and he is getting a lot of success there, why would he want to leave? I would understand Real Madrid to a point because he could get a lot of success there as well, but why would he go to PSG when they already have so many strikers and still fail.
I think PSG should try to keep Mbappe as much as they possibly can, and if they can do that it would be great for them, but if they fail to do it then they could find some other players that could increase the overall value of a club. Like instead of replacing a 200 million dollar player, increase 5 places on the squad with 40+ million dollar valuation of the current roster, and you get a 200 million dollar increase anyway.