Well, MBappé is probably regretting ever signing with PSG. PL teams probably want players to produce right away. The Madrid bought very young players, some will probably end being really good.
The last offer for MBappé was €200M, sent despite the offer of €170 + 10 wasn't even informally answered. Perhaps they wanted to show MBappé they tried everything, knowing PSG wouldn't even answer.
Pérez will take notice, the Madrid could start talking to more than just MBappé or move some strings so that PSG ends with problems for the financial fair play.
Tbh, the concept of a foreign monarchy financing a football club somewhere in France makes no sense and what's worse, the way they treat players that want to leave is detrimental to the game.
I remember Ronaldo's first stint in the United, he was one of maybe 10 best players in the world, but the moment he hit the ground in Madrid, he became Messi's equal and one of 5 best ever. I think not even Ferguson could believe what was seeing.
MBappé will never reach his full potential in PSG, leading the Madrid he can be recognized as the world's best player and will have many comercial opportunities, far offsetting any higher salaries the PSG may pay, plus he could make football history.
If he re-signs, the Madrid will just bring another players, that will end having greater careers despite having less talent.