Example of Centralized wallets
1. Coinbase
2. Nexo
3. Luno
4. Xapo
5. Freewallet
Any wallets that ask you create an account with mail and password is centralized, they monitor your private keys for you, be smart
But if you have huge amount of money it will be best if you will just put it in a safe way and centralized exchange is not one of them.