I would like to use game covers provided by twitch.api for my social mobile app for gamers and I have some problems with publishing on Google Play because of an unauthorized use of copyrighted content. Now, I use game covers from twitch api for screenshots in store and overall inside of the app. I used to think that all of API stuff is free for usage, but now it seems more complexable.
So, my question is can I use these game covers legaly without agreement from copyright owner like Blizzard, Valve and etc. ? So, If its legally where I can find proofs of that?
Thanks in advance,