Like Vod said admin is awere of this issue and the reason why the Yobit set the max 20 daily posts was because thats how the run their
previous campaign back in the year 2015 . I guess they are not aware of the present situation of the forum and I think you should have send the person in charge of their PMs first before creating this thread.
Meanwhile, I will advice them to set atleast 30 minutes post gap.
There we go - pretty decent idea. Yobit (or any campaign for that matter perhaps?) should count a maximum of 1 payable post per 30 minutes or maybe 3 per hour (1 every 20 minutes). Until then you'll have the farmers make those "post short-round bursts".