even if you are not trading, you can really earn rewards and I hope this system that they have lasts
Not your keys, not your coins. Risking for such rewards definitely not worth in most cases. I do see people are staking in exchanges for some rewards but definitely high risky one. Still, staking within a wallet is good because your coins are not leaving off your wallet.
And staking in a private wallet with trusted dApps is completely DEFI and it's indeed safer than on Exchange there is a possibility of some hacking or something, but if you want to try to compare you can try both.
several staking platforms that may be an option and examples such as on the Solana network
https://www.alchemy.com/dapps/list-of/liquid-staking-platforms-on-solana