It's definitely ban evasion if you tell an organization that you don't want the service that they forced you to use and they still do it anyways, the nuance of it just being a staging server that could have been hidden from the public (or at least used a robots.txt) is irrelevant.
I don't make call-out posts at all, but figuring out what this bot that joined out of nowhere that started doing things without our request - who operates it? is it malicious? do we want to keep it? - wasted at least 10 hours (and counting) of volunteers deliberating and debating in a community that I participate in.
Why do the volunteer-run communities that trust matrix.org have to clean up the mess by matrix.org? Discord uses announcements when rolling out features.