It's a negative sum speculative vehicle. For every $1 that goes in exactly $1 can come out - minus miner fees. Any gains in welfare are illusory.

Options, futures and commodities are zero-sum, because gains for one party are distributed directly from the other party's losses.

Stocks are positive sum because companies have earnings, revenues and profits. They use this income to grow the business, pay dividends or re-purpose shares. It's absolutely the case that you can get more than $1 out for each $1 put into share ownership.

Hope that clarifies the difference.