There's no brainer if we do compare out bank interest to APY which been offered with staking with altcoins which you do say that most of them are scams and the rest do really fails. 5-10% APY is really realistic
but offering above those numbers are basically not really that suggestable for you to engage on and as been said or mentioned that its price would be crashing until you do end up on earning nothing or peanuts.
Its never been recommended to consider out staking as a good way of investing considering the duration and risk involved into it.
Up to 16% is still fine because I've seen legitimate exchanges that do offer that APY for staking some specific tokens and coins. The risk on it is that your fund is on exchange.
And you know what comes with that risk when you don't hold the keys and that's going to be on the exchange's jurisdiction and you'll never know if they've been casually checking their security for loopholes.