Karl Fogel at
Today's thought: "A centralized online service will always trade the interests of its users for the interests of its billable clients." Looking at you, @SlackHQ, re https://mashable.com/2018/03/21/slack-direct-message-privacy-change/ and https://opkode.com/blog/slacks-bait-and-switch/ (At @OpenTechStrat we use @Zulip for chat and it's great.)
I've actually cooled on XMPP due to how poorly it often handles network transitions and temporary dropouts making it kindof a terrible experience on mobile devices, but yeah, I'd certainly rather use XMPP than Slack. Perhaps a better Slack alternative is Matrix/Riot.im, which has most of the upsides that Slack does but is federated and entirely FOSS (it still has an IRC bridge, too, unlike Slack).