I'm far from stating that t_d used bots to push submissions up, because there is no definite proof, but what I know for sure is that the US election ruined browsing /r/all for me. While it was mostly porn and memes before, every now and then I would bump into something interesting from a subreddit I didn't know. But during the election it was 90% of either t_d or sandersforpresident.

EDIT: Apparently reddit has changed the /r/all algorithm so this is no longer true. Thanks everyone for informing me!