well, talking about crypto as a public figure nowadays can get you in trouble I don't think that a huge youtuber would influence a market that much but I do believe that the more public you are the less you should talk about crypto you might have a surprise knocking at your door one day.
By eliminating the middle man with blockchain we became our own bank, and I'm sure some peeps would love to get the nano S edge of one of those public individual figures if they were talking crypto, let's face it a geek with a usb key is a lot easier than an armored van....