PSG strongly punished Mbappe, forcing him to renew his contract or accept the transfer immediately. If not, he will receive his salary and sit on the bench watching his teammates play. But not stopping there, I also heard that he will not be able to practice or participate in team activities until a replacement is decided. On the other hand, Mbappe still respects the contract with PSG when committing to play the whole season with the club. He also did not announce his departure, Still working hard. Therefore, the fact that PSG suppressed and banned Mbappe from participating in club activities was baseless because he showed no signs of violating team discipline.
As you say, PSG should lower the price and make concessions to sell him quickly. Otherwise, the person who suffers the most is themselves.
If you look at the Mbappe transfer Saga so far it is very interesting. PSG wants to sell Mbappe as soon as possible because he doesn't want to extend his contract, on the other hand, Mbappe himself wants to last one season with PSG without extending the contract.
It looks like PSG is punishing Mbappe because PSG sold him at a very high price. So far the Saudi Arabian club wants to sign him for a high price tag of around €200 million, but I'm sure Mbappe will turn it down. The news is that Chelsea also wants and is interested in signing Mbappe, and we all know Mbappe himself wants to go to Real Madrid. Indeed, Real Madrid wants to bring in Mbappe because so far Real Madrid does not have the right person to replace Benzema, but right now Real Madrid only wants to bring in Mbappe for free next season. I suspect that Real Madrid also punished Mbappe because last season Mbappe did not receive an offer from Real Madrid. Because if you look at Real Madrid, they are not a club that doesn't have money. If they are serious about buying Mbappe, why hasn't Real Madrid done anything to Mbappe until now? even though PSG themselves have registered Mbappe on the transfer market.