It would also be difficult to insure. If you're providing any Service Level Agreement, or something where you are taking money and selling based on a quality li

It would also be difficult to insure. If you're providing any Service Level Agreement, or something where you are taking money and selling based on a quality like security; you are going to fail at some point and get sued as a result; so your upfront costs and pricing structure have to reflect that. Gmail can be free because it's a free service and you get what you pay for. To provide something of an equivalent service level for money with an additional guarantee of watchdog security services; you'd probably have to start around $10,000 USD per customer/year. And who's going to pay $10K for an email account?