Kickback.com and Zengaming.co - Earn CSGO skins by 1v1ing

Kickback and Zengaming are both csgo 1v1 services where you can win skins.

Zengaming | nonref is straightforward, if you win a 1v1, you get 10 coins, if you lose one, you don't lose anything. You can then redeem skins for those coins. The skins are priced weirdly, so its hard to say what one coin is worth, but knives start at 17500 coins.

Kickback | nonref is a little bit more polished than zengaming imo. In kickback you wager certain amounts of currency (called rubies) on the matches you play. So if you wager 100 rubies, if you win, you get 100 rubies, but if you lose, you lose 100 rubies.

There is also a passive way to get rubies, simply put kickback.com in your steam name and you will automatically earn 50 - 150 rubies a day depending on how long you have had kickback in your name. 1000 rubies = $1, and skins prices are based on the steam market. So even if you don't want to 1v1, you can still make up to $4.50 a month passively. You can sell skins for paypal at OPSkins.