I think people who have a lot of fund will have opportunity to gain bigger profit. But it's not a guarantee. In my opinion, people who can gain profit from this investment are those who buy and sell in correct time. I only have small amount of money but it always doubled every bullish market trend. So I sold at that time then buy btc again when bearish market trend happen. Another example is, I bought TRX at lowest level at bearish market few weeks ago and now if I sell it then I can get 200% of profit, but I will not sell it now because I think bullish market trend is even not starting yet. So in my point of view, investing in bitcoin and other cryptocurrencies need knowledge and experience, not just big fund.
Bitcoin investment gives equal opportunities to whatever your social status is. But knowing rich people have definitely more funds to invest, so their opportunities to double their profits is bigger compared to those who only invest from a middle class. Still, i don't see financial stability is mandatory to be a gainer in bitcoin investments although its really a big factor but being knowledgeable and flexible are still the most important things so you can be profitable. There are those who came from a poor family but end up very successful in bitcoin because they have the full determination and persistency to learn and develop their own strategies so they can avoid losing often and maximize the profits. So being financially stable is not a guarantee, its simply being the best of you that will attract more success in life.