It's not instantaneous, therefore you have to have faith in the system (as opposed to faith in your bank). Sender sends $150 million and receiver needs to wait

It's not instantaneous, therefore you have to have faith in the system (as opposed to faith in your bank). Sender sends $150 million and receiver needs to wait 30 minutes for enough verifiers to trust the transfer went through. In the meantime, the $150 million is in limbo.