Is it?
Discord seems to be way better
Teams are good enough
Discord seems to be way better
Teams are good enough
Discord seems to be way better
The only thing better about teams is that it comes 'free' with Microsoft 365. Though you can now take that without it for about 1.50 per month less. But slack costs a lot more.
On paper they can do the same but slack is just so much better in terms of UX. Though i do hate that they dropped the IRC bridge. I have been active in slack communities a lot less as a result. I always have my IRC open but not slack.
It's not clear to me that you actually save money by using worse technology, if it takes more time to do stuff (after you've restarted teams three times to try to get share screen to work, for example).
Internalise the profits, externalise the negatives. It's what companies do but also what departments do within companies.