DPoS by its design is more centralized than the other PoW blockchains, trading decentalization for speed and efficiency.
Doubling down on that centralization is the rule
This basically made the blockchain corporate governed. Especially in its first years. In the last years the decentralization increased with more than 100M STEEM being distributed, and a lot of sales by STINC.
Still this rule one stake = 30 votes remained the week spot that allowed this thing to happen even with 20% to 30% stake owned.
Don't blame the actors, blame the system!
If there was, one stake = one vote rule, scale it as much as you want to as many witnesses you want, what happen today wouldn't be possible.
Blockchain Governance Models | Should Steem Governance Model Be Changed?