Should a 5 year old be allowed to watch Jake Paul on YouTube?

I’ve noticed my 5 year old niece watching Jake Paul on YouTube when I am babysitting her. Should I tell her to stop or just let her continue? I don’t watch his videos so I don’t know how inappropriate they are, I’ve only heard bad things about his videos.
Update: Her mom knows nothing about Jake Paul so I thought it might help to see what people who have actually watched his video's opinions are. I will be discussing it with her though.
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