Hhampuz managed his campaign sooner, so I really confused the later one managed by Crypto Girl, in which also has signature campaign but payments will counted on stakes each week.
Match Billion should confirm about the one.
That's not new in crypto, the one that Hhampuz manager is purely signature campaign only and participants are guaranteed with weekly ETH which they can sell anytime once they receive it, because it's liquid. Bounty campaign compose of different task and paid in tokens, so bounty participants can only sell when it's already in exchange. Also, campaign mangers might have different payment structure for that, and as long it runs well, I don't see a problem on that.