Doesn't Amazon/AWS use this very heavily? Whenever we have to get on a call with AWS engineers it's through Chime.
As a product, it seems fine. I'm not entirely sure it's an area AWS really needed to have a competitor, but now that they do, /shrug
At every org I've had to interface at a deep level with AWS, they've used our Zoom. n=1
If you get rid of chime you also get rid of slack huddles (built on Chime). Like many AWS services the backend of Chime is good, the UX/UI is terrible.
TIL, interesting design decision on Slack's part.
It was a business decision because slack's old /call command was built on a startup they aquired. I don't know the details but I'm sure Amazon gets deep discounts on slack and slack get's the same for chime.