The negatives are probably around the fact that Cloudflare is soon to be the master of the web (80/443) If they launch an email service and are as successful,

The negatives are probably around the fact that Cloudflare is soon to be the master of the web (80/443) If they launch an email service and are as successful, they could become the master of the email (25/465) So soon, they'll be the master of the entire Internet To be clear: I don't share this view, in part because Google and Microsoft already are the masters of the email