Spoke briefly about this on the Nightdev Discord but was told this would be a better place to post as it's easier to follow. With the release of the /announce (and it's sister commands for differing colours) on March 31st/April 1st - is it possible that this functionality could be added to Nightbot to allow custom commands to utilize the announcement feature?
This will help chat to see those messages a lot easier especially when only leveraging the feature for useful commands, of course this is down to the channel manager's of Nightbot custom commands.
Other than spam, I do not see any permanent damage this could cause, and for most channel's it would be extremely useful.