Is minecraft a dangerous game for an 8?

Is minecraft a dangerous game for an 8?
Added (1). Is minecraft a dangerous game for an 8 yr old who has ADHD? He acesses it through you tube and will watch it for hours on end it has taken over his life. He seems to have all the information about it in his head and can reel off all the strategies one by one. He is my stepson i have him during the school holidays. I am wondering is this normal for kids nowadays he was on minecraft the whole time. It seems to have become an addiction.
Added (2). Is minecraft a dangerous game for an 8 yr old boy who has ADHD

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