I am part of a global network that communicates via email groups (google groups). People have proposed to use other communication modes like Slack. This was turned down because people argued that these apps are not effective for low bandwidths.
Is Matter most a good choice when working with people who have bad internet connections and older, often mobile operating systems? If not, do you know alternatives?
Here is more information on our software and hardware requirements, especially what operating systems are required: https://docs.mattermost.com/install/requirements.html.
We have been continuously improving mobile stability on poorer network connections and you can see in this Jira epic which tickets have been completed and which ones we are still working on: https://mattermost.atlassian.net/browse/MM-13065.
If you want to, you can join our community server to test whether Mattermost could be an option for you.