Do you have third party extensions installed? If so, try disabling them, as they may subscribe you to channels without your permission: https://yt.be/help/2abj . Also, if you're using a shared device, sign out of any Google services when not in use. Keep us posted.
@TeamYouTube today I was browsing my second channel and saw channels that I was subscribed many years ago and channels that I was never subscribed at all. On some of them notifications where turned on. Why????
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