When will yobit resume the signature campaign? If you worry about the post quality, you can simply improve the rule threshold to avoid spamming.
Yobit signature campaign isn't closed, it's only closed for new participants. And I think they will never open campaign for new participants, and reson isn't spam or low quality posts. Yobit become well known and popular site, they don't need to be advertised very active like new services nned.