When you want to earn on bustabit then you should be patient always wait for the mark of bust for 7 straight
I don't think this will work there, i have just checked history and seen bust below 2x for 8 times in straight. 
Actually there is no any working strategy for bustabit, you have learn to make early exit before you get bust.
if you've seen bust below than 2x, 8 straight loses, it means this should be work, you just need to bet higher than your 7 loses before and BAM!, you will get profit if 9th of your bet is green.