There is some downside of staking in comparison to banks. If it is an altcoin you are staking the price of your initial investment will also surge with the whole market. That means you could gain additional altcoin but its price in USD could fall below your initial investment. This won't happen with banks because of stable fiat currency. Also if you are providing liquidity then you should know about impermanent loss too.
staking our altcoin maybe more suitable for long term purpose which is less volatility price and rise steadyly , maybe atleast 1 or 2years we will got two benefits from its APY and also price increase. moreover if there any stakedrop program that usually in cosmos ecosystem, more benefits we will got
It can't be denied that staking is the most profitable technique today, with staking we can get big profits and even many projects that offer APY of up to thousands of percent, and bank interest is currently very unprofitable because it only earns interest of less than 1% per month.
you must also recgnized market volatility too, dont ever you get huge apy but in total amount impermanent loss due some reason.