Who is Yield Guild Games?

Could you elaborate on the identity and significance of Yield Guild Games? I'm curious to understand their role in the cryptocurrency and gaming industries. Are they a development studio, an investment group, or perhaps a hybrid entity? What are their key projects and how do they leverage blockchain technology to create value? Additionally, how do they contribute to the growth and adoption of cryptocurrencies in the gaming community? I'd appreciate a concise yet comprehensive description of who Yield Guild Games are and their place in the evolving digital economy.