If YouTube is a shopping mall, it’s a mall in some libertarian ‘utopia’ where there are no public sidewalks at all - no government-owned forum which is freely available to all. Not only that, individual property ownership is rare as well: businesses typically own their property, but for your average citizen it’s too difficult and expensive a process to go through with unless there’s a good reason. So even if you only want to share your beliefs with friends, people who will specifically visit your house to listen to you (rather than the random passerby who might hear you on the sidewalk)… you’re going to have to acquire a house first. Actually, for some reason, you can obtain housing relatively cheaply if you promise to only communicate by handing out written text; but most people just want to talk face-to-face (i.e. with video), which is much more expensive.
(Oh, and there aren’t public roads, either. There’s just one big private road network, which finances itself by placing billboards on the roads. For the most part, they’ll build out roads to any location, big or small, without worrying about what kind of activity goes on in those locations. But only for the most part…)
Luckily, most people never need to deal with these difficulties! There‘s one big shopping mall chain that dominates the whole country - most of the world, even. (It’s owned by the same company as the road network.) And it has a really nice offer for everyone: you can have all the space you want to engage in everything from idle chitchat to grave political lectures, from science demos to showing off your video game skills - all for free. Plus, the mall staff takes care of efficiently guiding people around to speakers that might interest them, so it’s really easy to spend hours bouncing from one interesting session to the next, with all your needs taken care of. Altogether, a highly engaging, communal, even productive environment. Much nicer than going to someone’s house. The only catch is that the staff will never recommend anything outside the mall, no matter how relevant. Oh, and... there is that mall cop. He mostly stays out of sight, though. There are only a few things that bother him, so just make sure to steer clear of those and he’ll leave you alone. Although, he does sometimes change the rules at a whim… and if he does kick you out, there’s almost nowhere else to go…