Kylian Mbappe has been frozen out of the PSG first-team and will not play until his contract runs out next summer; Mbappe felt PSG would be signing Robert Lewandowski and Bernardo Silva when he signed his current deal last year; Mbappe rejected a £258m move to Al-Hilal
Seems to come down to whether your skills and appeal eroding during a year of barebones training are outweighed by the lesser but similar risk of playing in Saudi, combined also with uprooting your life for a year and assuming a higher risk of injury.
I would far far far prefer getting paid 100M to sit in Paris for a year than getting paid 150M to get beat to shit by the heat playing in Saudi Arabia. Doubly so if Paris were my home where my family was.