Here are some examples of this at work, in this case the Slack alternative Mattermost:
1. Our own instance in DE, used for online training
2. My friend's instance served from under her desk, on which I teach her students in CA
3. An instance in CH hosting thousands of environmental defenders that I deployed
4 An instance we deployed in IS hosting a US immigration support NGO, resistant to ICE warrants
There is no one deployment for all here, each instance meets the unique needs of the group