Without converting to the same currency it’s not obvious. Which is why you are taxed when an asset is sold, until then it’s purely theoretically valuable.
Suppose you sell it in six months or sixty years. Then, you can compare USD to USD and say it was a good or bad investment. Alternatively, you could say you wished you had waited a year to buy the stock.
This is important for bitcoin as you have people that buy in and have yet to sell and can’t yet say if they made a good or bad investment for them. However, with dividend stocks you can hit the point where dividends are greater than total investments thus even if nobody ever sells becase it fails the company was still a positive net investment across all investors even if some lost money.
Long story short it’s possible for companies to a net positive investment, it is not possible for Bitcoin to be. If it’s value hits 0$ then you look at all the investments and people spent X buying it, payed Y keeping the network running, and made X - Y selling it which must be less than X.
TLDR: Individials can make money in the lottery, from perymid schemes, or from Bitcoin, but on net they are all poor investments.