The fact that something increases in value does not make it fraudulent, and it does not make it a pyramid scheme or a Ponzi scheme.
Also, you do not have 100% guarantee of profit buying this week and selling next week.
Let us stop. Second circle?
something increases exponetially, and EVEN on the constant field, this is the HUGE problem.
what about pyramid, it is just criterium of your honestness: are you also GAMER interested, with opinion biased.
If you read me pedantically you see, my schema with attraction of 1 000 000 mining people is pyramid itself till 90% of bitcoins will be mined.
If you still do not understand why my pyramid is honest, and your one is wrong, you did not simply read my posts pedantically.
hint: I introduced TWO functions - linear increase till 90% BTC mined & exponential decrease after 90% BTC mined.