Of course, the more that player spends, the more free Robux you will get. Roblox affiliate program is very straightforward - each new player you bring to their platform that makes a purchase will get you free Robux.
However, their reward inventory simply cannot come as close to one of Freecash, which is a superior choice. Lastly, Idle Empire is another alternative to get free Robux in Roblox, which is similar to Freecash (we wrote a review about Idle-Empire here). You'll then receive a gift code that you can redeem and add funds to your Roblox account, then use those funds to buy Robux in Roblox! Currently, you can get 400 Robux for $4.99, 800 Robux for $9.99, and 1700 Robux for $19.99.