Slack is an interesting one. Suppose you're a company spending a lot on it, too much. What are your options?
Replacing slack with a comparable like Teams or Gchat is at least a step back in user-friendliness that will be grumbled about by engineers and others, and if you use a lot of integrations there might be significant switching costs.
Moving away from instant messaging as a communication pattern sounds great to me, but good luck convincing folks to change company culture that significantly.
This is exactly what's happening at a previous employer. We used slack for near a decade with tons of integrations. It's now being unceremoniously ripped out because Teams is "free". Will probably cost them more than they're saving from the contract just because of the migration cost.
How big of a team costs that much? Looks like the highest listed price is $180/person/year before it becomes "call us" pricing. Im sure that enterprise plan can get expensive, but even at $500/person/year that's at least 2000 users.
I'd hope there's lots of things higher on the list of effective cost savings before trying to migrate that many users, and integrations, and history.
Such migrations are happening and will continue to happen, but I expect most will go about as well as the one discussed in a sibling comment.
Replacing slack with a comparable like Teams or Gchat is at least a step back in user-friendliness that will be grumbled about by engineers and others, and if you use a lot of integrations there might be significant switching costs.
Moving away from instant messaging as a communication pattern sounds great to me, but good luck convincing folks to change company culture that significantly.