The important thing to remember with any of those spreads is the fact that exchange wallets will always be in the top 100 (unless they just started) and many exchanges have more than one address (i.e. hot/cold wallets).  The other thing to remember when considering the 'fairness' is that BC was extremely fair in it's distribution - the problem which now appears to be lopsided, is that a ton of people that mined it in the PoW phase just dumped everything and moved on to the next coin.

In most cases they dumped those coins into investors like me who were just gobbling them up all the way down to 450 sats - and then all the way up to (in my case when I ran out of BTC and any other alts I was holding to throw at BC).  As time goes on and those of us that were here at the beginning and have held throughout decide to take profits - there will slowly be greater distribution.

However, just like it is with anything of value... invariably there will always just be a few with a majority of the value.  Consider USD... that's somewhere around 1% controlling 95% of it.  In light of other forms of wealth, cryptos are possibly the most fair distribution of value we've seen on the planet since the invention of money.