FWIW it's not something I had "my" employees do. The practice started organically and continues to exists because everyone created their own channel and kept going with it.

One thing I suggested was that they should be muted by default so that they aren't a distraction and don't set the expectation that they should be read.

I thought it would be interesting to write about because it was an emergent practice that seems to be sticky and useful within our team.