This is why they changed their API to make bots that serve too many servers (100 maybe?) become verified and go through an application process to be able to ask for the message content intent, which was part of discord bot libraries revolting for a while. But their choice was actually a pretty good middle ground. There's very good reason to allow devs to build out and actually test the functionality on their own server or couple of servers without the giant limiting factor of getting someone from discord to evaluate every feature you might possibly add.

If they're doing this through regular user accounts instead, I don't know what you expect discord to do. Public servers aren't private. Hundreds to thousands of people can see your messages. They're not that different than posting them in any other public forum. Technical limitations only go so far.