Thank you for posting @felixxx.
There a few issues that could stand addressing.
One way of solving the self-voting may be to limit the number of posts a day.
Also you may have noticed there is a real abuse of the comment section with entire organized groups commenting without voting on said post.....am I correct in thinking this takes value from those who did vote or not? How this could be addressed....I do not know. What I do know is that it is bubbling to the surface as an issue....there are already posts about it.
Thank you for your work as a witness...it is appreciated.
All the best.
Cheers.
Limiting the number of posts per account per day is not a solution - It can be easily gamed by creating multiple accounts.