We all know PSG is a rich team just like Real Madrid. They are doing everything possible to retain Kylian Mbappe, but about the future, I think there are a bit too extravagant. Some years ago, so many clubs went bankrupt as a result of this same act. clubs like PARMA FC (105 million euros dept) GLASGOW RANGERS (30 million pounds debt), Fiorentina (32 million pounds debt ) so many other clubs went bankrupt some years after indulging in this same act. I wish PSG isn't the next victim of bankruptcy.
They even have better finance than Real Madrid with support from their owner but their model is not sustainable as same as Real Madrid's. You are so realistic to compare PSG with bankrupted club like Parma and in reality we have more examples from Deportivo La Coruna, Leeds United, SS Lazio, SS Napoli. They overpsent money after one or two successful seasons, over leveraged and got bankrupted.
I don't know what will happen with PSG in future but at the moment we know that they usually get negative net in finance in many seasons. That is not good for them to unable to earn income from sports itself and rely on their owner group.
Real Madrid use leverages too but they are one of best clubs in aspect of earning money from football. They are one of most successful clubs in history and PSG are too small to compare with Real Madrid.