I have checked the richlist recently, some of them are from exchanges. More than 50% of BTC are holding by the top 50 people or so. Can't remember the amount though. I have two question-
1. Exchanges are being the giant although BTC holding by them are from customers. Still it's possible that they are trying to be a controller of the crypto community which is very bad I guess.
Just like banks, these exchanges hold immense power and influence in the entire cryptocurrency market, whether we like it or not. Many of them are centralized organizations, and they are mainly for profits, of course. Is this good or bad. I would say that this set-up has some advantages and disadvantages, mostly depending on the person's point of view. Just like Binance, a very successful crypto exchange that is lording the industry it is on and eventually launched its own coin the BNB. I would not say that they are "controller" as the digital assets they are holding are not really theirs but who can discount the big influence of Binance in this industry?
2. If top 50 people hold 50% of BTC and BTC becomes the global currency, we may face once again the previous era. Being slaver to certain people. Think at from the point of macro economy. In my opinion, it's something we need to talk.
Maybe what you have in mind is the current wealth distribution of wealth where only a certain or small percentage of the population owned the vast control of available resources and maybe thinking that the same thing can be happening with Bitcoin and cryptocurrency in general. Actually you can be right. However, Bitcoin is not a tool to redistribute the wealth, far from that. And people who are concerned on this should maybe start buying Bitcoin and distribute to the homeless and the poor. The thing is that there is nothing we can do in case Bitcoin is not properly distributed to the population. Anyway, holding a Bitcoin does not mean that anybody can be the maser of the universe, and he can be commanding people to be his slaves. Far from that. I love some of the ideals socialists are offering but generally many of their ideas (as man-made as they can be) are not also working. Anyway, I digress.