At some point the pyramid has to reach a bottom.
There is no infinite grown in this universe. Especially not exponential growth.
Even if you assume that we'll reach space at some point and infinitely expand into the universe. Resources available to that civilisation will grow at most cubically (based on the fact that our universe has 3 dimensions).
That growth is not caused by magic, the reason why you'd still get a return of investment is because that growth has been fuelled in an unsustainable way with externalised costs.
So for the "small long term investor" the pyramid ends at enslaved children in Bangladesh sewing shirts and shoes, overfished oceans, pollution, and climate-change.
Pensioners and small investors get scammed by the rich and powerful above them, the kid in Bangladesh, the Somalian fisherman, the person dying during a hurricane, flood, or heatwave, got scammed by everybody else above them.
Somebody gets scammed when there is a continuous indefinite return from a single investment.