How is that remotely acceptable?
There really should be some kind of law against ludicrous shit like that.
People will say "Discord is a private service and nobody's forcing you to use it" but reality is not as black and white as that.
For example, what if your employer invites you to a meeting using a privacy-abusing service like Discord or Google Hangouts? Are you going to risk telling your employer that you're not joining an important meeting because you don't want to use a service without your VPN? What if some important club/charity/etc. has its members in a Discord group?
These services blur the lines between private enterprise and social utility. Like Facebook, services offering "mass interaction" or whatever should be subject to much stronger privacy laws.
The current state of things can't continue.