If anything it sounds like the OP mistook this for a pyramid, thinking that if he invested 6 months ago, or 12 months ago when price was at $60K he/she would benefit more than those who invest today at $20K. Sadly for them, Bitcoin isn't a pyramid, so it's not necessarily a case of investing early means higher profits that those who invest later. Oh well.
This has been the number one thing that I tried to explain to people and they ignored me. If crypto was a ponzi, it would have been gone already, it has been over 10 years since we did this and we shouldn't really be focusing on this at all. At the time ponzi was a thing that was used in many different places, and even today there are a lot of ponzi schemes all around the world, so I understand the fear people would have.
But it is like saying dollar is a ponzi scheme, or stock market is a ponzi scheme. Just because it requires people to buy and get into it, doesn't mean that it needs to be a ponzi scheme. I mean it’s so obvious that crypto isn't and never was a ponzi, it’s right there and it’s too obvious.