You should not join such projects , they are really irresponsible and lazy .
I usually do not participate in these projects .You should join in projects that they always update that will make us work better
I would like to recommend in joining a such project check the background and past history of the bounty manager recent work. You can see if he/she is competitive enough to run a bounty campaign. There are some bounty managers who are newbie in this kind of service without experience and handling a pressure work.