I can't even believe it. Messi? Intermiami? The stadion of intermiami has only 18k seats.
That makes two of us 
But coming to think of it , I think he choose a league that he could settle in without much of the media & the paparazzi on his back as he prepares for retirement, and with Messi leaving Europe this is the end of the CR7-Messi era and time for players like Mbappe,Rashford, Neymar, Halaad etc to step up their game and cement their names to football's record books.
Btw I thought he would be following CR7 in Saudi Arabia after his last visit, but I guess he chose peace and quiet over a fat pay cheque, and its understandable especially that he has his family in the picture, hope Inter Miami make good memories for him.
The Inter maimi contract is worth more than just a one-time pay cheque from Saudi Arabia; he would receive a percentage of every new subscription to the MLS season pass from Apple, a percentage of Inter shirt sales from Adidas, and an offer to buy a stake in the club when he retires; that, to me, is worth more than a one-time $1 billion contract. He has guaranteed a bright future for himself and his children, and retiring as a club owner is a big accomplishment.