Slack's bait and switch

A blog post on federation, chat, and Slack's "bait and switch":

"You can set up your own email server, and send emails to people with their own email servers, or to people with Gmail or Yahoo! accounts. You can email any other email address in the world, regardless of where that address is hosted. The reason email is federated is because it was developed before surveillance capitalism was a thing, and because it was established long before these companies existed."