In fact, you have to change marketing seriously. Byteball it is not decentralized, and never will by design.
The cause is simply: when I want to become a witness, I have to ask EVERY NETWORK NODE (controlling byteball main hub would do this easier).
Very different is the case when I want to become a miner, I DON'T HAVE TO ASK ANYONE.
Because of that, PoW is decentralized, and Byteball not.
Byteball is a DISTRIBUTED database with twelve high reputable nodes that help network to reach consensus.
That twelve nodes FORM a single point of failure, and the power those witnesses have over the network is not related to this fact.
Don't pretend to be what you are not.
That is indeed a problem. What could a solution look like?
A secret witness routing the database via TOR?
Publicly known witnesses could easily be eliminated by state despotism and violence.
There is no solution. Byteball team has to assume the truth, and act accordingly. Starting with calling the process "witness distribution" instead of "witness decentralization".
Acceptance comes later, after some intermediate states.