You need to bet the entire free bet when you're using it. You can't seperate a $25 free bet as $10 in one game and $15 in another game.
Also, the freebet initial doesn't come back to you, that's why you bet $25 on 2.0 odds and only got $25 (only the earnings). You can see how much you will earn before clicking the free bet button (to put the bet).
As I imagined, that's exactly it. I think I was quite lucky, because the probability of me losing was very high. It was a very unpredictable match. In the first half, Botafoco thrashed Mirassol 3-0, but in the second half, Mirassol managed to equalize. I was very lucky.
It seems the free bet voucher must be used on a single bet. Thank you for clarifying my doubt.
There have been quite a few draws since then, I think the Whale.io is one of the only casinos that runs these weekly raffles.