Those who invest in stablecoins, what do you expect from such investment? The % you get for sending your stables into some kind of earning programs are lower than 1%. Transaction fees and inflation kills all the profit from such actions. So why then you invest in stables?
Good question.
People expect from stablecoins to overcome the deficiencies of fiat currencies i.e. protecting themselves from inflation, losing purchasing power because of depreciation of their fiat currency.
Contrary to "unstable" cryptos, stablecoins aren't there in order to make people rich.
Earnings and gains aren't important in case of stablecoins.
For ordinary people the question is how to keep the purchasing power of their money.
The volatility of "unstable" cryptos runs against this goal: Volatility means going up and down.
Down means that while it goes downward the crypto holder loses purchasing power.
Ordinary people can't afford the volatility of "unstable" cryptos.
That's the reason why the adoption of cryptocurrencies as everyday money is still in its infancy.