I played Madden NFL 21 on Chromecast during my 4K TV
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Personally, I pay an extra fee to Mut 21 coins have unlimited data on my private home network. However, for those without that choice, data utilization is a large element for Stadia games.
In terms of data usage, it will naturally vary according to your quality preferences. If you're intending to play Madden NFL 21 using Stadia Guru at 4K then you are likely looking at around 16-20GB of information use per hour. As this is a game you can play solo, online, or locally with friends on the exact same Stadia link (through Chromecast with multiple Stadia controllers or on mobile or a PC browser with multiple controllers plugged in), it is impossible to know precisely how much data it will suck since hours will change for everyone.
I played Madden NFL 21 on Chromecast during my 4K TV, on PC at a Microsoft Edge Browser, also on mobile with the Razer Kishi and utilizing just touchscreen controls. Unexpectedly, Madden is actually quite playable using touchscreen controllers as soon as you get accustomed to where the digital buttons are located. I'm still frustrated that I can't remap or change at which the buttons are in my display since doing things like holding R2 to sprint are embarrassing if you would like to also be able to buy Madden 21 coins cover the ball up prior to an effect or immediately juke with the right stick.