Was?
You could claim that Bitcoin is a ponzi scheme.
If miners can’t sell 3,600 per day (6 block/h * 24 h * 25 BTC/block) the price drops until all collapses.
Bitcoin is (financially) only sustainable if fresh money enters the scene and creates BTC demand day after day.
Sounds strange, I know.
Feel free to invalidate that claim if you will.
But better don’t tell the rest of the crypto world - it might be perceived as an attack on a quasi religious belief…