My free idea: when using different analytics services, I'm sick of having to add the tracking code and then reconfigure the same users and events for every new service.

So my idea is a third-party site that only collects your data once, and then serves it to other products. Kinda like Twilio for analytics, if you will.

As an added benefit, new analytics startups wouldn't have to build the "collect data in real time" brick. So that might help them focus more on what to do with your data, instead of on how to collect it.