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 ?
Equality is a word that should never be associated with humans and the distribution of wealth and resources, there will always be inequality in everything, regardless of how we pretend. Even nature itself has proven that many times.
Let's also be clear, I don't think that Bitcoin preaches the equality of its wealth distribution as you take it, but an equal access, opportunity and right. A system where the government's interference would be reduced (decentralisation). And since its inception, Bitcoin has done so well in these regards, it's now left to us to determine the size of our Bitcoin purchase to hold the power of its welath.