If everyone had a friend that had a server we coulddp some fun stuff with federation and decentralization. Decentralized federated social networks without spam and without much need for moderation. Backup (I’ve always wanted to offer friends a family a backup service. I’d like to have a friend with a server so that I can backup my backups on their sever and in exchange they can do the same on mine). Almost free hosting (if I have my own home server I could provide friends with the option to host their static site for free which could be acceded by any server on the federated network