It doesn't really matter. There are 4970 even digits and 5030 odd digits in the first 10,000. Predicting all odds gives you a better-than-even chance of being right.
What does "highly unbalanced" mean?
How often will a random sequence be "highly unbalanced"?
How many people used another model, found no pattern, and never reported it?
You have plenty of data to work with. Try the second 10,000, the third 10,000 and so on.
Keep clear in your mind that a lot of people worked on this problem, including trained mathematicians. It is far more likely that you do not fully understand what you are doing than that they are wrong. Believing otherwise is the path of crankdom.
What does "highly unbalanced" mean?
How often will a random sequence be "highly unbalanced"?
How many people used another model, found no pattern, and never reported it?
You have plenty of data to work with. Try the second 10,000, the third 10,000 and so on.
Keep clear in your mind that a lot of people worked on this problem, including trained mathematicians. It is far more likely that you do not fully understand what you are doing than that they are wrong. Believing otherwise is the path of crankdom.