If you don’t live in a major US city or haven’t visited one in the past year, then there’s a good chance you’ve never heard of the e-scooter sharing economy. It’s just like Uber and Lyft except the vehicles are electric scooters. Flashy or not, their rise has been meteoric.

The two frontrunners – Lime and Bird – are each valued at over $2 Billion and they’ve been operating for less than 3 years. Bird was the quickest company to reach unicorn status ($1B valuation) – achieving it in just 10 months. Even Uber, Lyft, and Google are all staking their claim in this market.