Where did you hear Coinbase had been hacked multiple times?
I've never heard of a serious problem with Coinbase that completely drained the Coinbase wallet.
Some users are being hacked, but the majority are victims of phishing attacks.
Possibly this is what he is referring to. Clinbase users are strangely having phishing attack more than other exchange ma users. I think Coinbase customers data were hacked and seen and known by hackers is the reason.
If you receive a BTC in your wallet(non-custodial) then it is store in your wallet not om the blockchain .
The similar function for blockchain is database where all transactions are recorded publicly unless you talking about the blockchain wallet?
The coins are nit stored on the wallet, it is nmstired on the blockchain. Noncustodial wallets have the keys and addresses. The coins are stored on the blockchain with the help of the private key and which it can only also be used to spend the coins but the coins is actually on the public ledger which is blockchain.