I remember when I used the feedback mechanism built into the Slack app on macOS to submit a bug report, and someone from Slack got back to be promptly to acknowledge the problem and ask for some more detail. Then the bug was fixed a few days later. This was many years ago.
Today, I can't even find the feedback feature in the Slack app. It's easy to blame Salesforce for this—and I do, because it's also probably correct. (That, and the usual transition from "scrappy startup" to "big company.")