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If you observe, real-estate properties also gaining its value in the way how bitcoin is gaining now. A real-estate business is a pyramid system ?
You picked an unfortunate example
Of course the real estate market is comparable to a pyramid scheme in most countries in the world.
Interest rates are low and therefore the amount of activity on the market goes through the
roof (new buildings, people buy homes that they can´t really afford, banks give credit
to non-solvent buyers).
In order to prevent a collapse of the real estate market a continuous influx
of new buyers is needed. If the amount of new participants in the
real estate
scam market is insufficient, the whole system collapses
and people lose a fortune (their own home or own flat is often
a very big part of their net worth).
I´d even argue that the real estate market needs new participants even more
than Bitcoin.