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 ?
That is simply the economics of law of supply and demand. Before, there was not that much demand and the supplies have cheaper price. Few believers and they're at an advantage for buying that time. The early days were also uncertain and they deserve what they have now and they've just endured for how many years before they can take the profit. There were people that have heard bitcoin but never done actions. So, there is a equality in all of it because if there's none, then bitcoin isn't for everyone. But what we can see right now is that, there are rich, middle class, poor and even institutions that are on it.