Herding exists, but at some point I suspect the fact that more working business use the one rather than the other would have some meaning.

That being said, the good thing about mIRC / Bugzilla is that no-one prevents you from using them for your business, so go for it !

People who complain about these products probably aren't in the position to use something else, or they probably would have switched already.

I use IRC all the time, and IRCCloud makes it comparable to Slack.