The term “stablecoin” can be often misleading, they are refferred to as stable not because they preserve real-world purchasing power, it’s because they maintain a fixed peg to the U.S. dollar. So while 1 USDT is pegged to the USD which sometimes depreciate, you can’t escape inflation by holding USDT since it’s just a digital version of USD.
They’re stable in crypto terms given it’s not volatile but far from stable in the broader economic sense. Maybe we should stop calling them "stable" and start calling them ‘fiat mirrors’ LOL.