What is the difference between a community and a team/service center? To me a community would be people within testing but with different line managers and on different projects/products. In one org. I was once a place where we had a Competence manager, making it a project/line/competence (3d) matrix org. Recently I am working where we are joining the test people in the geographic locations in one team instead of across teams. That is making a huge impact on knowledge sharing etc.
Perhaps a community is more loose - around a shared sharing platform (“theClub”, yammer, slack) that you volunteer into - rather than assigned to? reminds me of these old pieces: https://jlottosen.wordpress.com/2012/10/06/tips-and-tricks-for-community-building/ https://jlottosen.wordpress.com/2012/01/19/lego-community-key-social-media-lessons/