Does the performance of individual data ownership hosted at home actually change very much when people have gigabit upload speeds? Since applications can already make multiple asynchronous requests, if we’re imagining that applications would need to request user data from each user’s house, the upload speeds would primarily affect latency and not necessarily throughput. If this does affect throughput, and it certainly might, then I’d guess that everyone having gigabit upload speeds doesn’t fix the problem. If we’re talking about something like Reddit and Facebook needing to make external requests for every comment in a long thread, I’d wager that it wouldn’t matter if every single request could upload at 100GB/s, it would still be hundreds of times slower than what we have today.

Even if I’m wildly in favor of user control over data, I’d venture to say that there still is no choice but to use someone else’s computers, and not just for performance reasons. If applications have to gather every individual user’s data that gets shown to another user from somewhere outside their servers every time, won’t reliability and consistency and UX likely become nonexistent, in addition to the unusable performance?