"Email as ID" is a great idea. But will it survive the pressure to monetize the service? If you ever want to sell the business, buyers will want more reliable I

"Email as ID" is a great idea. But will it survive the pressure to monetize the service? If you ever want to sell the business, buyers will want more reliable IDs. One big thing I've been wanting from such a service is subscription to users I find interesting. Someone has posted a great insight? I add the user to my list and my daily email now includes whatever that user has posted yesterday. The email has links to unsubscribe from users. As a side effect, this breaks echo chambers: unusually motivated users won't be able to spam your subscriptions, and won't be able to ban you - the only ban is when others unsubscribe from you.