I think they do it because getting you to go to the thing is the point, not watch the thing. Once you’ve gone to the thing they just want you to go to the next thing. Watching the thing is just wasted time for them.
It probably has to do with maximizing your exposure to advertising.

Reddit is the best thing to ever happen to big governments. It’s wonderful for mind-control and surveillance. They are subsidized by the intelligence apparatus of USA, China, Great Britain and lots of other countries.