'unlikely tech unicorn' ....why is it unlikely? Someone was going to dominate the smb tier of email marketing and mailchimp have executed really well.
The whole valley 'unicorn' schtik is what's unlikely, it's just glib VC speak for fast bucks and easy money
Precisely the point of Aileen Lee (of Cowboy Ventures) when she coined the term.
But like "cloud" it's been gobbled up by people who didn't know what it meant and has been bent into a parody of itself.
(not to imply at all that a "unicorn firm" is as profound an idea as not caring how your packets are routed but rather connecting to a resource on the network)