Only a YouTube hater would say crap like that since anyone with a half-decent brain knows that YouTube is way, way more popular than the other platforms which were mentioned in some of the previous posts.
You are right. YouTube is more popular than Twitch and it's not fair to compare them to each other. However, twitch is more suitable for streamer especially gamers, thanks to its features.
Youtube rules and terms are more strict then Twitch. So, if a type of content is banned on twitch, you can be sure it will not be accepted on youtube.
Although I am not a fan of tiktok as I believe it's mostly used by the Gen Z, it looks like it's the new trend and it may replace those old streaming platforms.