@TeamYouTube can you warn him because hes spamming on my channel so people can sub to himpic.twitter.com/BY4FQJ9qwq
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Hmm, have you tried blocking the user on YouTube? Here's how: https://goo.gl/3Q7Epb . This will prevent the user from seeing or commenting on content you've posted, and also in some other Google products and services. Hope this helps.