You are a fool. Do not be offended by your advice obsalyutno wrong. Exchangers are always subject to threats and attacks. There is money there. Or do you store your cryptocurrency in a separate secure vault at home in the safe. Or do you keep cryptocurrency in a landfill. Where every homeless (hacker) wants to steal your money.
You are saying that exchanges arent safe but crypto wallets are ? Both are the same dude . a wallet do also hold alot of funds and hackers are also targetting it . its not wrong to store funds on a wallet or on an exchange as long as you are sure that the wallet/exchange that you are using is legit . traders store funds on an exchange because they are trading on it automatically , same as on wallet but if you arent using your funds actively its a wise idea to withdrew them .