Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
It should, you guys must have seen how roblox has become laggy and glitchy after Adopt Me got famous. Especially during the Easter Egg Hunt event that literally made the whole site inaccessible for a short period of time due to the massive amount of players (reached a couple of hundred thousands) during that particular event.