Any stablecoin that follows the same logic as DAI (i.e. overcollateralized debt-based stablecoins) could also apply (at least in theory). This includes (but is not limited to) sUSD, MIM, LUSD, MAI, agEUR...
The "collateral" is a bunch of useless tokens that can flash crash in an instant. It is the same thing as the luna/Terra system but with minting $2 worth of luna for $1 worth of UST. Any depeg event will only be faster as compared to luna
It is not the same because in the case of the coins above a flash crash results in liquidation of the collateral to support the peg. In the case of Luna there was no such mechanism as it relies on people doing the arbitrage required to maintain the peg.
