My Argument is, I do not understand the need to either own bitcoin or hate it. I just don't get the angry animosity. I don't see people going crazy about the $100M paintings. High end wine is another asset that has been going up in price, but I do not see people mortgaging their houses to invest into wine or scream about crazy people paying 10K per bottle, somehow everybody is OK with it. I argue that the idea behind bitcoin is remarkable and is worth understanding if nothing else.
Another point is this. Whatever you want to call the bitcoin an overvalued asset or if you think it should not be worth anything in USD it might be a very valid point and I won't argue against it. But do not call it a ponzi scheme. You can't call everything you do not like, or do not understand or you think is overvalued a ponzi scheme. No one is suggesting there is any kind of return on your investment, you are not investing into a fund or a business.
You think its overvalued, sure you make a good point. You think its worth 0, very well possible. But it is not a ponzi scheme. If you do not want to buy it you do not have to, just like $100M painting or $10K bottle of wine.