Mattermost is developed by another team https://about.mattermost.com/company/ https://about.mattermost.com/company/ that is separate from the GitLab/Gitter team

Mattermost is developed by another team https://about.mattermost.com/company/ https://about.mattermost.com/company/ that is separate from the GitLab/Gitter team. So I think both will continue to grow without affecting each other.