Real money can indeed be won on Starburst free spins. The funds earned during free spins will be turned into bonus funds which, in turn, must be wagered further before funds can be withdrawn. Essentially the money that is won acts as a bonus amount which is used during your gameplay on the Starburst slot.
Wagering requirements vary depending on the particular casino. Some may require you to wager x20 before any funds can be cashed out. This means if you win 100 during free spins you may only cash out once you have won 200. In this way the casino ensures that they make some profit while still awarding players with amazing free spins. Some casinos even offer a zero wagering requirement which will mean that all funds won during Starburst free spins can be cashed out immediately. In short the answer is yes, real money can be won with Starburst free spins!
In total you can get more than 100 No Deposit spins. Find Starburst no deposit spins here.