Since 20% commission isn’t enough of a deterrent and the Nakamoto index is now at 4 (after 100B moved to a wallet that delegated to a non-voting validator with 20% commission), maybe it’s time to raise the max commission to 25%.
I think we need something more radical.
How about we divert 100% of commissions and delegator rewards to the Oracle Pool for all validators with a voting power > x% (e.g. 4%). This will remove the incentive to operate, and delegate to, validators with excessive voting power (Essentially, we stop commissions/rewards for validators/delegators when the validator voting power exceeds some (governance defined) level).
Validators with large self-stakes will try to circumvent this by operating multiple validator nodes, but at least it will shine a light on the issue 
It will not make a difference. Even after implementation of the dynamic commission with the original max commission of 20% Allnodes’ VP barely came down (it did, but not because of the DynComm).
This means that users value reputation/safety more, and are willing to ‘pay’ for it with their rewards.
DynComm ‘works’ but it works in a way that makes a very small difference.
Nakomoto doesn’t matter as you have sybill validators anyways + let’s look at the whale WALLETS not validators.. currently we have 3 wallets holding almost 33.33%, and they do not care about commissions as 2 of these wallets belong to CEXes who are happy to profit from the commission.
That is why I said “validator commissions and delegator rewards” should cease above a certain (governance defined) voting power threshold.
If those large exchange controlled wallets still want to receive delegation rewards, they would be forced to spread their delegations across the active set to avoid pushing any individual validator voting power over that threshold.
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