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Custom ROMs have had just about enough of being Android's second-class citizens
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
FTC act is the most useful against this sort of behavior and only the FTC can file suit for that, not individual companies. I don't think this could be filed as a violation of the Sherman act. See here for an overview: https://www.ftc.gov/advice-guidance/competition-guidance/guide-antitrust-laws/antitrust-laws