I don't think this is a good bounty since this campaign wasn't in the right section. As you may know all bounty campaign especially signature campaign which paid in bitcoin will open the thread on this board https://bitcointalk.org/index.php?board=52.0 it shouldn't be in altcoin bounties section.

OXBTC is cloud mining site and I tried to looking for some information about OXBTC and I found this thread https://bitcointalk.org/index.php?topic=1732068.0 . Actually, not all bounty/signature have an escrow to distribute the reward, like a few months ago there was a signature campaign which paid in bitcoin and they didn't use an escrow to distribute the payment. But until now the campaign is still running and paid the participant on time.

It will be depend on the project team itself, because a good projecg will paid participant because they have a real service and can be used by all people. Unless if the project is scam then they will never pay the participant.