Just curious ..
1) How do I get my account rid of captcha everytime I click ?
2) How do I get the Bonus BTC to my rewards ? Eg: "Bonus +0.00000589 BTC added to all rewards!"
1) Deposit a certain amount of BTC. I think you can see the full requirements whenever you click on "Claim with No CAPTCHA"
2) Wager on multiplier/ betting. The amount depends on the progress to unlock higher amounts. Likewise, each claim reduces the bonus by a small amount.
If you don't want to wager you can just keep a balance above 100 USD to play without captcha.