Hi There!
I'm not aware of any youtube playthroughs of the game, but there was some chat about the game on Reddit closer to the release date and there are some reviews on the drive thru page: https://www.drivethrurpg.com/product/339514/Utopia
I always add a few community copies of the game up at the end of the month, based on how many sales were made, so if you're unsure about GMless games or just want to give the game a try and see if it's for you, feel free to grab one of the community copies to try it out. I'm adding the community copies for this month today.
If you like the game and want to throw me a couple dollars, you can always purchase a copy later, or there are physical copies available through DriveThruRPG.