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it is impossible to have the Steem blockchain without the witnesses. They are what makes it happen.

So they run the servers, and how does changes to the platform happen exactly?

changes to the steem blockchain happen through hardforks... 17 of the top 20 witnesses have to agree before a hardfork change is accepted.

Let's hope so @tolkatore I am not against the witness, I am in favor of acttive witness who raise their voice against unjust issue like reward pool abusing, bot voting etc.

I hear ya, and hopefully something is done about it.