Stupidly, anything that requires too much of a time commitment, which has led me easily to death by a million cuts. I'm conscious of my zoomer mentality in this respect, but it's much easier to generally piss away all your time on like, 50 tiktoks, that all last 5 seconds, compared to a TV show or a movie or whatever. The secondary effect, understated, I think, of this, and I think this is the kind of, horrible advantage of those platforms, is that you will inevitably spend more time trying to find stuff to look at that interests you, rather than actually watching content, so I think they can skate by a little more with a little less content. More efficient for them, less efficient for you.
I find myself doing the same thing with 10 minute youtube videos, but I also will end up watching multiple hour long video essays on random garbage, so I don't really know what that's about. Maybe just easier to convince myself that it's a "productive" activity, to learn about some random nonsense, as compared to engaging in some sort of probably wholly escapist form of media, that might in reality lend itself towards an easier foothold for conversations with other people? I dunno, maybe the problem is just kind of trying to look at media in terms of its pure utility value, rather than looking at media through some other lens.
Certainly, I think the biggest contributing factor is just environment. I'm on my computer and phone a lot more than on my e-reader or my TV, so I naturally engage with the easier to access forms of media found on those platforms. Regression to the lowest condom domino gator, or whatever.
Also, I feel like I've seen enough people answer "anime" that the anime... subs? boards? communities? communities sounds a little too long. Anyways, it should be more popular, but I really haven't seen any engagement on any of them, the anime holes.