Is ponzi scheme the new "it" word?
Bitcoins is a currency and a market. You don't talk about hyperinflation as a "ponzi scheme" or a "pyramide game"
The bubble we are seeing now is speccualtion based on what people think it will be worth in the future combined with a form of musical chairs like in any other highly volatile market.
It is most likely unsubstainable, at least for the near future, but it's not a ponzi or a pyramide.
Given a choice between learning something new and parroting a spoon-fed secondhand opinion, most people will do the latter and strenuously object to the former.
That's because they are sheeple. But they don't matter; only we top 1% IQ types actually change the world and write history. The rest are dead weight, kept around to clean our toilets, change our oil, and dig our ditches.
The dim witted sheeple are familiar with old ideas such as bubbles, Ponzi, and pyramid schemes.
It's a nice shortcut for the intellectually lazy/limited to use these comfortingly well worn tropes for reckoning about Bitcoin, instead of investing the mental effort and enduring the cognitive dissonance required to understand challenging new concepts.
That way they get say something (albeit completely unoriginal) about the new hotness everyone is talking about, satisfying both their herd instinct and desire to bleat for attention.