As soon as I heard of Segment, I knew they were onto something valuable and can only welcome more competition.
Now that I've been nice, allow me to get the plastic pitchfork.
I see no mention of GDPR, I assume you are going to restrict your market to NA for now? What about CCPA?
In the same vein I don't think you have any integration with open-sources alternatives to commercial software that one could host on premise.
That's an odd choice given the shape of things to come wrt privacy.