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Does anyone have instances of forking open-source software that supports a business in order to undercut that business?

mariadb / mysql? matomo / piwik.pro? It seems mostly done by the original developers however and not a new 3rd party.

Generally it seems to happen in response to Darth Vader deals "pray we do not change the terms further".

OS branches over technical direction disagreements are a closer thing but they generally aren't businesses.