some stablecoin are being used by some marketplaces where users can use USDT or USDC.
There is no stable coin in this world based on facts. The dolar loses so do stablecoins. Swaping Stanbelcoins cost money (fees) so were is that stable. Their algos have been seen bleeding when Luna crashed.
And no I'n not stalking you even though it's the 3rd post I answer and quote you. I hope you can forgive.
Inflation is a stablecoin that is artificially made due to some economic benefits. Don't want to talk about it in detail here but inflation in fiat is not always bad at least for a country's economy You are right that due to inflation we lose value. Still people wants to use stablecoin because stability is needed in a currency to conduct everyday transactions. If the currency value only rise then no one wants to sell it, which will create a liquidity crisis in the economy and if it loses its value quickly, then no one wants to keep that currency in their pocket.
Algo-based stable currencies are vulnerable which has been proven by the UST crash.