We are not sure yet, maybe Mbappe is just doing that to make his team spend more for him and increase his salary. Right now are see much news about PSG wanting to increase the salary of Mbappe and keep him in the team for the next season. That's why they did it the last time and it's not surprising to see the same story.
It seems to me that Mbappe and his entourage have already crossed some boundaries in this game, and therefore I still weakly believe that this is a finely planned strategy to increase the salary of a football player. Rather, here we are dealing with a classic case when the situation has got out of control and is already developing not according to a pre-planned scenario. Moreover, the sheikhs from Saudi Arabia, with their space proposals, brought even more uncertainty into the situation and generally confused the cards of Mbappe's entourage.
I don't think Mbappe's camp did this on purpose. The offer was brought to them. The way I see it, if anybody orchestrated the whole thing it would be PSG.
Maybe PSG got tired of playing games with Madrid and they decided to involve their Arabian friends. In this deal PSG will be the biggest winner because they will receive a very high amount o money and offload Mbappe without paying him the agreed 66m.
Now if that doesn't work out, this will force Madrid's hand into signing Mbappe now. Either way, PSG gets rid of Mbappe while receiving a huge amount and not paying any 66m.