Let's be clear on what custody means here: Deutsche Bank would hold clients' crypto and manage access to it. Some funds and companies need an established custodian before they can hold $BTC or $ETH. So you're basically trusting the bank to store your tokens, and it handles security for a fee. You still rely on a third party, which comes with its own risks. But for institutions that can't run their own wallets, this makes holding crypto way more practical.