If you know him personally and really trust him, why not, but in most cases I'm very careful by following suggestions advertised by YouTubers. It's often possible they get paid for advertising this ICO and if they get paid they are biased. Hiding things in their review who are critical to gain investors. I don't want to be too critical, but after all it's your money and the marketing process in ICOs is sometimes very shady by using bumping services here in this forum, paying ICO rating platforms... Bounties are going to be big advertising machines flooding the internet with positive comments about the project how great it is...

Also this affects the entire crypto space in a bad way, all the spam created only for advertising these projects. I'm preferring the core facts of a project and not advertisements done by ICO shills.