You can enter Fastcup's twitch gaming page from the link below.
It gives you a free skin after every match (they are not trash skins).
If you get on the leaderboard, you get extra high rewards (high class items or gloves-knives).
You are not asked to open any streams. Therefore, you can open the game and stay afk.
There is no report system yet (at least I have been leaving my 30 accounts afk and farming skins for about 2 weeks. Nothing has happened to any of my accounts.)
Since the matches are 9 rounds, they end quickly. So, with approximately 1 account per day, you can earn skins between 20-25 dollars.

Im using VM for multi-accounts. Good luck!

https://gaming-twitch.com/join