It offers nothing for sure. The project could do airdrop easily to make participants voting to earn. There's no even need to create a new project that related to the vote to earn. The idea looks like unuseful idea. It seems like that the new developers are struggling to find a new innovation and started to create more and more project with non sense idea which can be done easily since a long time ago through offering airdrop to the participants to vote.
I think that this idea is just only gimmick to be used as money grabber only. That idea was making everything to be even more complicated. You can vote and simply earn the reward.
Converting vote as a mining power to receive the token is a wasteful idea for sure.