Those who acquired bitcoin in early days got larger share in less price. Later when there are very less bitcoins left to be mined and prices are astronomically high, it will be hard to acquire even fractions of bitcoins. Where is equality concept associated with bitcoin then ?
Bitcoin wasn't created for equality or anything like that, it wasn't even created to become an investment asset but it was created to serve as a decentralized peer-to-peer payment method to provide people a medium to send and receive money anywhere in the world with no central authority involved in the process, and that's what it still does but it has become more of an investment asset than a payment method now.
Satoshi never aimed to keep the supply low so that it can gain value over time, he knew people are going to use the technology if it gets viral, but that doesn't mean he wanted Bitcoin to become this valuable some day, but because he didn't make the supply a lot, which he could if he wanted, but that all being said, Bitcoin was never meant to bring equality or anything. Bitcoin is just like any money, whoever has money can have Bitcoin, it's just that when it had a low price, most people didn't want to have it, and now everyone wants a share of the pie.