Why would someone be removed from the Core Team/Working Groups/OSM/Community/Project/etc?
From Joomla! Documentation
Sometimes, the Joomla! project has to deal with people that are detrimental to the overall health or success of the project. On rare occasions, people need to be removed in part or completely in order to protect the health of the community, the project, or the sanity of its members. There are a few reasons why someone could be removed including: intentionally harming the project, being continuously disruptive, repeatedly violating of the Code of Conduct, etc. We do not take these decisions lightly and we always give several warnings and opportunities to turn around before taking a drastic step such as removal from one of the teams or banning.