I just got a random promotional email from coinbase. This email has no unsubscribe button on it at all so I google'd "unsubscribe from coinbase email" to see why this is, and this came up along with this: https://emails.coinbase.com/unsub. Am I missing something and they telepathically know what email address I want to unsubscribe on or this is the worst email spam-scam I've ever seen?