The wired thing about this campaign is it doesn't have limit of participants, and i thing that's the real spam source. Each day more user will join to that campaign because the pay rate isn't bad at all, but 20 daily posts mean 140 post/week, and at the end is in our hands to report the spammers and in hands of the mods to ban those users.
Not weird and I'm 100% they've thought of that.
An avalanche of members will join their campaign and if it's too much to pay and no immediate results they will trim it themselves.
Besides, by not going the normal route of confirming participants, you get spammers with thousands of posts making 100 posts a week and wearing your signature for free as after a week you can simply deny them payments:P.
A lot will not get paid, they have nowhere to complain cause if they do around here nobody will take a spammer's side.
ps.
I'm pretty sure that how much trading you do on yobit will have a huge say on the chances of getting paid
Is there a limit of posts per day total ...
And probably there is a limit to the participants.
Plus, local forum branches are not paid.