At the end of the day, what matters is not decentralization per se but finding a consensus in a trustless way over the internet I believe.
If Nu shareholders decide to have a few very big nodes that somehow process most of the transactions (because small nodes cannot keep up with bigger and bigger blocks) rapidly and in a “multi-sig way” while being funded by the DAC, so be it.
Bitcoin would work much better if it was a DAC.
Shareholders would decide in a trustless way who mines.
People would say that the network is centralized by a handful of shareholders but that is not bad per se. What matters is that shareholders do not need to trust each other when they make such a decision.
In fact what we have right now is centralization of bitcoin because more than 50% of mining is operated by 2 miners and 90% of mining is operated by less than 10 miners.
The big big problem is that nobody has any control over those miners in a trustless way.
In Bitcoin, there is no clear distinction between mining and voting, and miners and shareholders so much so that there is no mechanism that lets you take decisions in a trustless way.
I feel that now is the start of the dismiss of bitcoin as a decentralized network to leave the way for DACs. That smells bad for bitcoin but luckly Humanity has Nu!