Seems feasible. As Raspberry Pi 4 with 8GB ram, 64GB flash, ethernet (for a DSL or cable modem), and wifi could meet most peoples needs for file sharing (like

Seems feasible. As Raspberry Pi 4 with 8GB ram, 64GB flash, ethernet (for a DSL or cable modem), and wifi could meet most peoples needs for file sharing (like dropbox), gmail like web email, chat (matrix or similar), etc. Trick is it needs to be robust, trivial to use, and pushed by a well recognized name to get decent market share. Ideally they would find each other via a DHT and even offer to trade services (storage, backups, replacing a down service, etc.) Having these in a decent fraction of households would help mitigate the usual downsides of P2P (slow transfers, slow startup time, etc).