Threads allow for infinite spam

When you create a thread of a message, the person who made the message is automatically in the thread. When in the thread notification settings are automatically on all messages. So you can keep creating threads and every time someone leaves or fixes the notification settings you just make a new thread with their message.

There needs to be a setting where u can disable people from making threads of your message or a setting that allows you to set all threads to @mentions only.