There were rumors that PSG also wanted to cut his salary because they are afraid that the same might be happening to them as it did to Juventus Turin. Since they also have to take into account that players like Neymar or Mbappe could be leaving, they would have to find replacements at the same time.
But yes I agree, money probably won't be the main issue. If Messi thinks that the fans suck, he could easily leave and go elsewhere. His relationship is not and will never be the same as it was with the Barcelona fans. But still I wonder how Barcelona would ever be able to pay his salary.
He has been linked with a number of big clubs in recent months because his contract is about to expire with PSG. Previously, Messi was preparing to sign a new contract with PSG after winning the World Cup. However, now he is starting to have doubts because PSG intends to cut his salary by 25%, and because of this, in my opinion, it is very unlikely that Messi will extend his contract at PSG.
Apart from the salary cut, in my opinion, the factor of the PSG fans can also be one of the reasons for Messi's departure. According to rumors circulating, it is reported that Messi has now opened the door for all clubs who want to ask for his hand, including the opportunity to return to Barcelona.