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It said terminated "due to spam or malicious intent", then the follow up question was "is there a way to grow my channel?". So, I assume he posted to every other piano YouTube channel in the comments section and said "come see my channel!" and people flagged him a few times. Just my guess, though..
But how to grow your channel? Let me know once you find out. I've had a piano channel for a whopping 7 years and tens of thousands of views but only 37 subs, so heck if I know. (I have a different gaming channel that got 600 subs in a year, though, so who knows.)