There is nothing to check. We're not saying that you are using a bot or doing anything wrong. What we are saying is that bots have become increasingly sophisticated and difficult to combat and that has forced us to make some changes.
There is now an algorithm that determines the level of reward.
The algorithm for reducing rewards takes a combination of the balance, wager, lottery and jackpot spending to calculate the reward. Jackpot spending has a higher weight (4x) and the lottery has the highest weight (20x).
If you do not want to gamble you can keep a balance above $50 to not have reduced rewards.
Most users will not need to keep the full balance though because their gambling history is also added up to calculate.
New accounts have full rewards for the first 100 rolls to help them build up a history and then the algorithm is applied to them. So opening a new account might seem like it helps but it won't.
Additionally, the balance needed to have no captcha is $100.
I did not know that, thank you for the clarification! =)