Yes the info is out there. The point is that not everyone is you or I. You are siding with a losing strategy. A lot of people aren't going to say on some random Tuesdays, "I wonder if there was some movie trailers I missed last week?" Then go on YouTube and seek them out. That's not the norm for the majority of people. I haven't argued that it isn't easy to find the content. Nothing is hard to find with the Internet. I'm saying just because someone might not be that aware of a movie, doesn't mean they live under a rock like you and a few others seem to think. It's the studios job to get the eyes on the content. And getting a handle on that will only improve engagement with films.
You're putting a lot of faith in algorithms. As I said earlier, movies are a huge part of what I interact with. I watch a lot of trailers, trailer breakdowns, movie analysis, general movie news... But m17 never showed up for me. I've watched it a couple times now and guess what, it still hasn't shown up on its own. The point is, it doesn't always work. I don't live under a rock because I didn't see that trailer, it happens. The difference is I went and searched out the new trailers. A lot of people aren't going to do that, it's not important enough in their priorities. And that's fine. Some people just like seeing movies but they don't go searching out trailers to make sure there's not something they missed.