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Google spent $26 billion to hide this phone setting from you
(www.washingtonpost.com)
This is a most excellent place for technology news and articles.
LibreWolf for example removes the telemetry but is ultimately still updating to each new Firefox version. In the event of Mozilla going under, some project would need to pick up the maintenance of the actual browser core that the "forks" are pulling updates from.
Far less likely than Microsoft "going under" but sure, let's pretend that's a giant concern for the users.