Nowadays there are companies which sport hundreds or thousands of alt accounts to drive marketing or political agendas. Posts like the Enchroma (scam) advertising on r/pics last week are just the obvious tip of the ice berg.
Companies share post templates to just fill and spread in targeted subreddits. Many mods are paid for channeling the "right" content just like Instagram/YT influencers are paid for product placements.
It's not some hobbyist forum for the more popular subs. It's a marketing engine.