There are many explanations of what happened to TerraUSD - it was very vulnerable. Those that are interested may look this up, as the information is readily available.
My 2c:
-at this point in blockchain's short history, one needs to view BTC and alt. coins in separate categories, not just "cryptos"; they are very, very different; i.e. there's BTC, and there are "cryptos";
-keeping in mind the ultimate trend - the Game of Thrones - i.e. the War of Currencies ---> the true battle that underlies most of the other trends - at least to some extent - the battle of how long King USD has left as top dog:
-TerraUSD was doomed to be attacked and crushed, since it didn't hold USD as collateral; it tried to peg itself to the USD using algos and LUNA, but the point here is that stablecoins that don't hold USD as collateral, imo, are going to be targeted and destroyed, or at least smashed;
-Tether has some problems, and this is widely known, but it at least holds some USD as collateral;
-ultimately, I see USDC as the big winner in terms of stablecoins, at least for some time; it doesn't have the bad press that Tether has been getting for like, years, and Goldman Sachs appears to be behind USDC.
-I generally don't like to bet against Goldman Sachs too much.