For me, the reason why Bitcoin became king is because he is always at the top, and when he is said to be like a king, he is always followed by those who are below him in terms of price value.
Because it has been witnessed by other communities here in the past few halvings, when the value of Bitcoin increases, most potential cryptocurrencies also follow its rise, and if the value of Bitcoin falls, most or all other cryptocurrencies also follow the fall in the price value they have.
Bitcoin is said to be king because it is decentralized in nature.
2. It has limited supply which is 21m
3. It is used for payment without a third party across boarders.
4. Bitcoin stands as an hedge to inflation.
5.Bitcoin is also use as a store of value and an asset.
6. All altcoins depends on bitcoin price movement.
7. The halving event.