Intuitively people understand that what is going on with Bitcoin is a bubble.
Due to the continuous flow of buyers the price keeps going up.
However the price which is most quoted is in ‘stable’ coins - USDT,USDC, and not in fiat USD…
If even a small fraction of of all BTC holders decide to cash out and get fiat USD, a crypto-exchange or a stable coin issuer just don’t have enough fiat to satisfy the requests.