Really the whole child grooming/CIA recruitment/cyber bullying thing is unavoidable on any form of free social media and these sort of crackdowns inhibit free speech more than they actually inhibit the illegal activity. If you have literally millions of people using any form of social media you have to use AI and algorithms to detect this sort of activity but then you get thousands of innocent people banned because they were RP'ing or some stuff.
Tumblr stopped doing NSFW content, died, and all the child enthusiasts/white supremacists/bullies/terrorists/jaywalkers moved over to Twitter/Discord. If you shut Discord/Twitter down you're just going to inhibit the free speech of millions and all the criminals will just go onto the next big thing. Teamspeak never had this problem because you had to purchase a server or run it on your own hardware which made illegal activity more easily traceable back to a real person. The best course of action would be to charge money for Discord servers that have over a certain amount of users. It doesn't need to be a whole lot, just $5 a month or something that way that transaction is tied to a real person and they can be traced down if they suspect that their Discord server is actively engaging in illegal activity. Plus, they could put that $5 per server toward hiring more content reviewers