Hi there, while there isn't an option to hide/remove the button. You can always share your thoughts using our 'Send Feedback' tool: https://goo.gl/WdI0BK . You may not get a response back, but we do review all of the feedback and use it to prioritize requests!
@TeamYouTube hey can you please add a button to remove cast to TV on mobile, it's really annoying having to restart my phone every time I accidentally press the button at 3am, thanks.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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