"For an explanation of why nobody is here, see https://blahblahblah https://blahblahblah." I'm not an IRC guy but I'm sure URLs are fairly common in topics. A

"For an explanation of why nobody is here, see https://blahblahblah https://blahblahblah." I'm not an IRC guy but I'm sure URLs are fairly common in topics. A human might still get offended but this will get past a bot. Heck, even something like "For information about channel etiquette, see https:/blahblahblah" would do. It just turns out that "channel etiquette" is to move to a different channel. It only has to hold for a little while anyhow. I'm sure there's going to be a long tail of people logging in for the first time in months and wondering what happened, but by now the majority probably already know, if not the vast majority.