Also the dollar backed ones would only fail if the foundations behind them fail (Eg. USDC)
https://www.cnbc.com/2023/03/11/stablecoin-usdc-breaks-dolla...
(Whether the risk is prices correctly can be discussed)
You're probably looking at coinmarketcap, which sets the price based on the trade pairs.
It is always $1.00 on coinbase.
Any who, even USDC appears to be relatively robost, though with another risk landscape than dai.
The implied "problem" with USDC isn't depeg, it is this (and who controls it):
https://gist.github.com/chappjc/350aafb9031f7a66986967bf8ab6...
Also the dollar backed ones would only fail if the foundations behind them fail (Eg. USDC)