House edge prevents you to keep doing that, eventually you will lose, even if it happens once or twice, mostly you will lose more than you earn.
Yeah that's the part of most new people were not knowing if gamblers are hit or earn high amount money because they've bet more than that.
However I have check Rollbit on their twitter, there are 20 random users get $20 tipped by Rollbit because they've commented on Rollbit's tweet [1]. They must be not expect that because Rollbit wasn't announce if they will give $20 to 20 random users, maybe they will do it again in the next month? I will not surprised if more people will make comment on Rollbit twitter after this one.
[1]
https://twitter.com/rollbitcom/status/1650354262784786432