I am just getting started with a Hub site and we have other groups within our organization that also maintain a Hub site. This is all great, my question is, can I invite Team members to help and contribute to my Hub site while protecting the content of the other groups site? Once I add a team member they automatically have access to all the Hub sites, is there a way I can restrict them to just 1 Hub site for editing and content management?
As you noted, the app isn't really intended to work this way but it is possible.
Alternatively, all initiatives by default come with their own team which can be a useful way to do this as well
* create a new initiative for each site
* create a site within the initiative ("New From Template" button)
* add members you want to the team for that initiative
Result: only members of each initiative team have access to each site.