According to the TOS, it is the right of the forum owners:
https://meta.discourse.org/tos#heading--enforcement
The company may restrict, suspend, or close your account on the forum according to its policy for handling copyright-related takedown requests, or if the company reasonably believes that you’ve broken any rule in these terms.
Agree, however, it is a good idea to notify users in their own profile if that is done.
For two decades on our forum, we have always notified users when our moderation team took any admin action and we provided users a process to appeal.
Sometimes even mods have a “bad day” and make mistakes, for sure.