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There are already SOME measures in place to stop people from making new accounts but those barriers can be easily overcome if you know a couple of tricks.

They need to implement a no multi-account rule that monitors transfers and account interactions. Clear and blatant abuses like the ones above should merit a lifetime IP ban from the site as well as confiscation of funds stolen.

That would be a massive invasion of privacy though. It wouldn't fly in the EU, especially considering that IP addresses are often treated as private information (as are phone numbers, for instance).

That's just a lawsuit waiting to happen.

It also defeats the purpose of having a decentralized social network. All of these things come with the territory. There are negative aspects. They are definite cons, but to come up with a centralized solution to these problems is also getting rid of everything that makes Steem better than other social networks.

IP addresses can be spoofed too.

Many people have multiple accounts on purpose to run bots. Some bots are very useful. Other bots are gaming the system. I'm all for abusers being called out for the abuse too.

Yeah, it would most likely lead to people just creating new accounts to post and upvote it with their main account. Then just send all the rewards from each new account to the main one to gain bigger upvotes.

Steem functions on the basic idea that everyone is honest. And that everyone will try to work towards a fair reward pool.

Human nature says that large SP holders should take as many as they can.

Maybe the gap between the idea of Steemit and human nature is just too big for it to work fairly..

That is always a possibility. I would rather Steemit stay true to what it is and fail than be turned into a centralized authority-policed mess.

Steemit does not function on that idea... It functions based on the idea that shareholders will protect their stake.