This P2P wireless Internet venture allows you to purchase hotspot access with cryptocurrency. Wificoin is a blockchain-powered project out of the TechCrunch Disrupt SF 2017 Hackathon that lets you "join any Wificoin hotspot to start using the Internet, or mine Wificoin (WIF) by hosting a node on your router."
New users receive 100 Wificoin when they try to join, which they can use to buy hotspot access. You can use Bitcoin or Ethereum to buy more Wificoin if you need more than 1 megabyte of Internet, or install the software on a router you own to earn Wificoin yourself when someone else uses it. According to TechCrunch this enables Wificoin to grow its presence internationally and make money at the same time.