A solution, largely, to the privacy issue with these sorts of sites is not to install their app. Instead, if you must watch their videos, do so in your web browser then they can only collect a very small amount of largely useless technical information and especially so if you instruct your web browser to delete all cookies when you exit the browser.
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland