Rather than starting a new thread (I would have worded the subject a lot stronger), let's bump and continue this one.
I am on iOS, and the T11 app used up 888 Mb in 10 days!!!! Completely unacceptable. I keep getting notices from my provider that I am about to run out of data, and I am on a 15 Gb/month plan with rollover, and have never had to watch my data usage before.
Questions (to users and developers):
1. Is there a feature (what the OP calls "sync") that I can turn off or switch to WiFi only?
2. Are the live matches streamed as videos or rendered in app? If they are streamed as videos, this could explain the data usage, and is bad design. Suggestion to other users: note your T11 data usage before a live match, then after, and see if there is a noticeable and consistent bump.
3. What about training? I train a lot since the new version. What can use data in that?
4. Is the app uploadign any data from my phone? What data and why?
5. Is there a bug causing constant redundant updates or synching?
Get on this right away, as this is a deal breaker. This could kill a great game and app for many users.