One could argue that we need more insight for administrators because of how "toxic" gaming communities can be.
Initially they had no export function at all. When they added it, they did so for paid plans only (and with an unpreventable notification to everyone on the workspace that an export was just triggered). They've evolved it since then for higher plans like Enterprise Grid w/o notifications and integration into Data Loss Prevention (DLP) tools, but it's still never touched free plans.
You can read about the initial announcement at https://www.theverge.com/2014/11/24/7255199/slack-alters-pri... . I would suspect that what you're positing to be a "complete history dump" from free Slack workspaces are from archive bots, which don't have the ability to eavesdrop on conversations in which they weren't already present.
That’s because discord “servers” aren’t real servers and it’s all a whole big closed-source SaaS.
“Server” is a clearly an intentionally misleading term and dark UX used to lure people into thinking they are have actual ownership and control of their fealty SaaS workspaces.
Sadly, given the success of Discord, it seems this lie has paid off big-time though.
Or they could just be adopting the terminology of TeamSpeak and the like.
"Hey hop on my mumble server"
"Hey hop on my vent server"
"Hey hop on my teamspeak server"
"Hey hop on my discord... guild?"