Coinbase is a centralized wallet. When you sign up on coinbase wallet you only have password of your account. Coinbase wallet will not give you any private key or seed phrase. As a result, if your account is ever locked or restricted, you will lose access to your account forever.
All the online exchanges and wallets are centralized and we can nothing about them if they shutdown or deny our withdrawals. That's why no one will recommended to store your funds on these exchanges for a long period of time. Did you have any amount in your coinbase wallet ?