How would you hoard wealth in a moneyless society? By taking a second portion at the free kitchen? Guess what: you're entitled to do so. But seriously: it doesn't have to be moneyless but money and property are social constructs and work the way, the society decides it does. How do people defend their wealth today? Take house occupations. It's many people who want to live there again one guy backed by the state. If the police wasn't on the table, the situation would be different. And it wouldn't be acceptable to leave a house empty in a usofruct system where you lose any right of something if you don't use it in any sense.
Similar with power. Good luck going to your local plenum and gaining power. It's much easier if there already is a central power structure to seize.
If you want to take the time: Anark had an appearance on 1Dime radio which is quite good as an entry into the topic. You'll find it on YouTube and Spotify. Anark is in general a great resource with short and long videos. Sorry for being the rEad tHEorY guy, my comment works without the last paragraph, it's just "further reading".
I mean it's so wild, no one would make it up