Hi @it33,
Thanks for the explanation. It doesn't look like the links are fixed. I mean the links at the bottom of the page here: https://gitlab.mattermost.com/community. They do all lead somewhere, but all four lead to a copy of https://gitlab.mattermost.com/static/help/about.html (which doesn't contain any ToS or privacy).
I guess my problem with the installation is that I really miss something intermediate between the test docker container and the 3-server production deployment (I've a team of under 20 people and no dedicated server). The unofficial docker image lazyfrosch/mattermost seems to go in that way, but it seems very obsolete. Any pointers would be very appreciated.