It's the proof of work. (POW)
All other financial systems are proof of stake (POS). That's where stakeholders control the system, including the rules, based off a percentage of their stake.
The POS system not only allows, but encourages the people at the top to actively screw everyone at the bottom.
The larger a stake you have (in POS), the larger and faster you can grow your stake. It's a system that actively concentrates wealth to the top at the expense of the bottom. It is naturally predatory. This is every form of money ever until Bitcoin.
The POW system puts everyone on an equal footing as far as Bitcoin is concerned. Sure, Bitcoin isn't going to fix people being mean and unfair to each other. But Bitcoin allows the people who use it to hold their wealth in a way that can't ever be debased or stolen.
POW creates a system where nobody can change the rules. Nobody can corrupt Bitcoin.
This difference (between POW & POS) is why people keep worrying about people who hold a lot of BTC being able to have greater control over the network. No. That's every crypto that's not Bitcoin.
Bitcoin is a miracle.
Furthermore, POW allows for only a single winner take all network protocol. This is desirable. It's Bitcoin. Literally. By definition. Bitcoin (BTC) is the proof of work Blockchain with the highest hash rate.