PSG consisted entirely of players who worked for money at that time. None of these players came to this team to be champions, all of them aimed to make money. Naturally, we did not see good harmony within the team and they could not be the best team.
Maybe if there were a few more players next to these star players, everything would have been different, but sometimes older star players are not enough

Having all superstar at a club don't give a team success. Even when Real Madrid signed all the best players in the world, things didn't work out well for them until they started adding some average players to the team to balance it. PSG players came for the money and they only played for that. The blame shouldn't be on the players but on the owners of the club as when you put money upfront for players, they'll choose to play for the money and not the passion. At some point Mbappe was also playing for the money and not the passion. We can see the difference in how he played at PSG and how he's hustling for goals now in Real Madrid to proof a point to everyone.