Speaking as a former moderator, sometimes it comes down to a judgment call. If this post had been about how to use discord in general, I would have warned and then closed if the direction didn't change. This one is asking why the in-game A/V is problematic, causing people to turn to third party solutions. It has value to Roll20 users directly, in that it discusses shortcomings with the built-in system and may lead to workarounds, or suggestions for improvement. That could still change and it could be closed. For instance, if it changed to an in-depth discussion of setting up a Discord call, plug-ins to handle music and so forth, it would be off topic, and likely closed, even though it is still remotely related to Roll20. No one would be in trouble for this, and frankly, moderators don't like telling people "no." But it's the job. A reason should always be given. Did you get no reason for closure in your closed threads?