The orange line is a same price % scale of BTC overlayed on top of BRK.B. The long term success of BRK.B is harder done than said. The volatility of Bitcoin is hellish compared to so many years of BRK.B succeeding including stock splits to keep the price down. If marginal shares were available to all people where a person could invest any amount of money they wished into the stock market perhaps more people would have become interested in stock trading before cryptocurrency succeeded. Cryptocurrency affords anyone to invest for any amount of money on any trade of cryptocurrency regardless of the price per share cost, unlike stock market. I know that marginal shares became a thing on Robinhood a couple years back. I am unaware of the progressive push by Robinhood and how their work influences other stock trading companies to improve their business model to appeal to a younger audience. Ironically, there is no way to put "BRK.B" into a tag. There is an understatement of percentage earned here as seen on the BRK.B chart because it doesn't account for all the stock splits over the years. One would have to create a modified chart to have a way to compare stocks that split versus cryptocurrency that does not, kind of like the, 'adjust for inflation' thing people always say and do.