Yeah both of them is wrong...
Can you please explain why it is wrong to use a feature offered by a gambling site?
This is no wrong about using this feature. I am just saying you are wrong after everything has passed and fixed
Yes, you are saying I am wrong, but you are not able to explain
why I am wrong?
You just say what you think, but legal assessment does not work based on thoughts as we have over 7 billion thoughts on the earth!
Legal assessment works based on publicly stated and applicable laws, yet you were not able to quote any of those and explain why he has no right to continue to play even though he was misleaded to click the |Cancel Bonus| button?
...and OP already fix this by sending his initial balance back.
According to your brainology, if you have a claim of 8.76 BTC and receive
75% less then the issue is fixed?
Are you joking? He deposit only 2 btc and
use the bonus to get the profit and cancel it, then he only supposed to get his whole profit? Are you saying this is right thing to do? So I can keep abuse it then, deposit 1 btc and win 10 btc so I will cancel it and get the profit as my bonus?
How was he able to use the bonus to get the profit while Duckdice's bonus rules stated "Bonus must be wagered 55x
to became a part of your balance."

His balance was 4.4 BTC, how do you determine that he played only with the 2.4 BTC bonus?
And after he won some BTC, how do you determine that he did not play with his winnings and not with his 2 BTC deposit, but only with the the 2.4 BTC bonus?
Was his account balance separated in 2 BTC deposit | 2.4 BTC bonus | 5 BTC winnings and the bets were reduced from the 2.4 BTC bonus?