Voting on your own post is possible, so it's not forbidden. There are also no rules or ethics defined about self voting.
I read quite a few reactions of people that did self vote, but didn't know the principle of voting and the 50% return you already get by voting.
But some people probably do it for extra earnings. That's not a behaviour for a social platform and people that have been around for a longer period should now and act better.
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