You know, I'm under the (possibly wrong) impression that it's $9 per workspace per month, and as a professor, if you include all the workspaces I was maintaining for my past classes, I have . . . or had . . . about 25 of them with hundreds of users. Maybe I wasn't using it the most efficient way, but I had no reason to think I needed to be strategic. And to think: I used to tell classes we were using Slack so their access would persist after they got kicked out of Canvas when they graduated!

It should have been possible for Slack to start the new limitations on new workspaces only. This term, because I started the change too late, I will continue to use Slack without enthusiasm while keeping a shadow archive (possibly in piazza but they have also begun to charge for larger classes). For next semester we will find and use a different service.