This extension didn't followed by extra or separate bounty allocation, which means they lied about bounty allocation and anyone following the bounty up to the end would have to work three times extra for the same payment (assume someone should get 1,000 USD for his work for the initial period, now they will have to work three times longer for the more or less same allocation).
When I tried to point out this issue, the BM said that it was on his authority to change rules whenever he wanted, which I counter by pointing out that the rules and duration are two separate things. Pretty shady and an abuse of a position of a bounty manager if I may give my opinion.
I don't judge them, because I don't join Match Billion's second campaign, but this is one of main reasons why I always want to keep myself away from ICO/IEO campaign. This one is not, but the rules are nearly the same. Such campaigns have rules changed arbitrarily, and participants don't known when they will get payments. That's weird and terrible for their participation if at the ends, they won't get any payment, even just a few cents. Good campaigns will - of course - changed rules, but they will only been changed after payments of the past round(s).