It is all up to PSG and whether they want to make some money selling Mbappe or not. I am sure they don't really need the money, so it is possible that we will see Mbappe play for PSG for another year against his real desire and intention.
To be honest if PSG was rarely making profit from the transfer saga between the football club. Mbappe already signed from monaco with €180m. I don't even think PSG will let him stay with no option to extend his contract till 2025.
That's why PSG said that if the club feel betrayed by mbappe. It's caused by mbappe will be leaving from the club with a free agent. That means if PSG will be losing €180m
It will be so good for PSG to sell him like €100m to another club before his contract will end, rather than get nothing from him.
Mbappe never had a great journey with PSG especially when it came to the UCL. Mbappe was only able helping PSG to go to the final against bayern but it lost.
€100m will be very useful for PSG rather than remaining year of mbappe in the club. It's caused by PSG will be able to sign the new superstar from another club.