And let me just emphasize again: T&Cs cannot make illegal behavior into something legal. If they're stealing coins or negligently failing to protect coins or negligently failing to protect their domain, that is all actionable. The only thing the T&Cs could do is force the customer to file suit in a specific court or to use arbitration; they can't change the fact that Blockchain has a duty to its customers.
I can't think of any other field where people think, "Eh, I gave hundreds of thousands of dollars to someone and they claim it's now gone, but I should have been more careful."[/i]
You seem to fail to understand how blockchain.com works and how bitcoin works.
Blockchain.com is a tool, helping you handle your coins.
The coins are not in their custody. It's not like Coinbase or Xapo wallet.
The coins are not in the wallet. They never are. They're "on the blockchain".
So it doesn't matter you have a wallet on blockchain.com if you or somebody else use your private key or seed, recover the wallet in - let's say Electrum and spend the funds from there. Obviously blockchain.com will also display them as gone.