Why Poloniex is included in your list this exchange was a scam since 2017 and it must be removed from your list.
I have been using this exchange (albeit rarely) since 2020, no scams have been noticed. Withdrawals are seamless, so I don't understand what kind of scam you're talking about here. About changing passwords, 2FA, and other information. This is practiced by many exchanges, not only CoinEx. Any change of data, including IP and browser, may provoke a temporary blocking of the account and a requirement to pass KYC.