AdRoll Raises $70M
techcrunch.com
techcrunch.com
Maybe AdRoll has better focus in general, maybe they do a better job of selling to a much larger group of mom and pop customers than Google and Facebook which may inevitably wind up focusing on big brand problems. It's usually not enough to have the same checklist features.
The same thing happened in Search Marketing software - initially lots of 3rd party companies moved in to offer software which enabled services beyond what Google enabled directly (Marin, Kenshoo, Efficient Frontier, etc...). Overtime Google has significantly increased the arsenal of tools available when buying direct from them, making it really tough to be a 3rd party search software provider, as you're basically just increasing the cost of the media.
People sign up for these services because they want a single place where they can manage all their audience data, a single place where they can create and optimize all their campaigns, a single conversion tracking system for all their retargeting, and a greater focus on support.