Could you elaborate on the potential future prospects of Celo? As a cryptocurrency and decentralized finance platform, what factors could contribute to its growth and success in the long run? Additionally, what challenges might Celo face in its quest for mainstream adoption and sustainability? How does it compare to other similar platforms in terms of innovation, scalability, and user experience? Lastly, what strategies could Celo adopt to overcome potential obstacles and ensure a bright future for its ecosystem?