That is surprising. The game is so popular and been ruining many family nights for years :)

I did manage to find the below at the App Store :
Monopoly Here and Now : TV Addition for Apple TV devices
https://itunes.apple.com/nz/app/monopoly-here-now-tv-edition/id1113047608?mt=8

I find an Ipad version on on a different site for sale for $4.99
MONOPOLY for iPad : Electronic Arts
https://sensortower.com/ios/us/electronic-arts/app/monopoly-for-ipad/405622181/overview