Just FYI residential ISPs are absolutely terrible. Even my ISP, a FTTH one, has uptime lower than 99%. This is aside from layers of CGNAT and your own home equipment's SLA. If you're willing to run a product on this kind of RasPi infrastructure feel free, but don't claim there isn't any value in a datacenter.
It's easy to setup a home raspberry pi. It's easy to go one step up and setup a colocated raspberry pi. It's easy to setup a managed dedicated server. Auto scaling virtually provisioned hardware is great for a big company like Netflix with actual daily fluctuating demand. Most people don't need such advanced scaling features.
I previously had Sonic.net, which was one of the best fiber offerings for consumers available. 1 gbps up and down, unmetered, and was pretty much never down during the period I had it.