It's because Bitcoin is the oldest, has the most trust, and a huge household name status. Nobody has broken the Bitcoin encryption and no fraudulent (double-spending) transactions have been conducted on the Bitcoin Blockchain.

Bitcoin also has the oldest technology and as such, there are more recent cryptos with incredible technological breakthroughs that make it possible for the crypto to be more secure, cost less electricity for transactions, and be easier to trade/buy valuable resources with. Smart contracts are the future and allow people to make loans and everything is automated through code.

It's because it's the oldest and has the most trust. Nobody has broken the Bitcoin encryption and no fraudulent (double-spending) transactions have been conducted on the Bitcoin Blockchain.

Bitcoin also has the oldest technology and as such, there are more recent cryptos with incredible technological breakthroughs that make it possible for the crypto to be more secure, cost less electricity for transactions, and be easier to trade/buy valuable resources with. Smart contracts are the future and allow people to make loans and everything is automated through code.