I’m incredibly skeptical of the self-hosting email server claims. With the past 30 years of spam, most of the majors make it nigh impossible to do so. I know there are diehards out there that make it happen; it’s not as easy as it was 20 years ago though.

Edit: Very useful HN thread with multiple perspectives (not just my doom and gloom)

The big given example was gigabit throughput. Most consumers in the US, businesses included, don’t have access to internet infrastructure capable of multigig because of regulatory capture. Those that do are already using multigig hardware which, unsurprisingly, hasn’t really changed much.