I don't know why you all choose to hold risky and unstable currencies, but Coinbase is now offering a non-destructive alternative mining program that can steadily earn 5% per day as long as you have USDT in your wallet
I am not sure Coinbase will run this program for a long time.
Anyway, people choose non-stablecoins because they offer bigger profits. They have big volatility, which means there will be a big gap between buying and selling. While for stablecoins, they don't fluctuate with big volatility, only a small movement in its price. This makes us have no chance of big profits to earn. That's why people don't want to invest in stablecoins.