The fact that Yobit did not prove to be an out-and-out scam and livecoin too hasn't been proved a scam exchange. Scam exchange would mean not paying any user like Cryptopia. Yobit can be considered shady (selectively paying out some and not the others) but not a complete scam and now as well yobit is paying out its participants without imposing any new rules or refusing payments which many members are taking advantage of as well.

The campaign anyways won't last long paying off 100+ members so I don't see an issue here but many members can end up getting banned as most of them are just spamming. It's again not something that can be termed illegal, fraudulent or scammy.