Unfortunately, the Stadia version of Madden 21 coins doesn't incorporate any Stadia exclusive attributes, such as State Share, Crowd Play, or anything similar to that. In case you decide to get Madden on Stadia, you would do this simply to have the flexibility of accessing the game on numerous devices seamlessly. The mobile-native version of Madden isn't anything like actual Madden, therefore getting the complete thing on mobile devices via Stadia is pretty cool.
Madden NFL 21 Stadia review Should you get it?
People have been awaiting for a very long time to get Madden NFL 21 on Stadia also it absolutely delivers. While it's true that this iteration of this long-running series does not have some significant improvements over this past year and is actually worse in a lot of ways (specifically Face of the Franchise) it is still a great base to start from on Stadia. If this is the first Madden game you have played in a while, you will probably be pretty happy.
Unfortunately, it simply hasn't evolved enough to justify a higher score. If they'd included several Stadia features, like State Share to send Cheap Mut 21 coins game scenario challenges to friends, or cross-progression or cross-play somehow that would have aided, but as it stands this is just a straight barebones interface of the Xbox One / PS4 edition of the game. It's good for what it is, however, not much more.