RE: Do We Really Want True Decentralization?
A very smart set of pros and cons to consider!
I think that in regards to the hackers, spammers, illegal content, etc., we can effectively shut them down through a community effort, i.e. someone pointing out the hack/spam/illegal aspect (ideally with proof, if needed) and the community downvoting them as a whole. This immediately underscores any attempts to profit from such activities.
If you have individuals who are trying to scam the system for fractions of a penny, it might not be quite as significant, but it would be quite easy to identify and take out bigger actors.
The only issue with this methodology comes when downvotes are used by large stakeholders to silence people for reasons such as: differing opinions and not using the blockchain the way they think it should be used. I've seen uncommon cases like this, and I can see that being a turn-off for some users.